get/setã¢ã¯ã»ãµãŒã«åãã¿ã€ããèŠæ±ãããšããçŸåšã®å¶çŽãç·©åããæ¹æ³ãããã°çŽ æŽããããšæããŸãã ããã¯ã次ã®ãããªç¶æ³ã§åœ¹ç«ã¡ãŸãã
class MyClass {
private _myDate: moment.Moment;
get myDate(): moment.Moment {
return this._myDate;
}
set myDate(value: Date | moment.Moment) {
this._myDate = moment(value);
}
}
çŸåšãããã¯äžå¯èœã®ããã§ãããç§ã¯æ¬¡ã®ãããªãã®ã«é Œããªããã°ãªããŸããã
class MyClass {
private _myDate: moment.Moment;
get myDate(): moment.Moment {
return this._myDate;
}
set myDate(value: moment.Moment) {
assert.fail('Setter for myDate is not available. Please use: setMyDate() instead');
}
setMyDate(value: Date | moment.Moment) {
this._myDate = moment(value);
}
}
ããã¯çæ³ããã¯ã»ã©é ããã®ã§ãããããŸããŸãªã¿ã€ããèš±å¯ãããã°ãã³ãŒãã¯ã¯ããã«ã¯ãªãŒã³ã«ãªããŸãã
ããããšãïŒ
ç§ã¯ãããã©ã®ããã«çŽ æŽãããããããã§èŠãããšãã§ããŸãïŒãããŠããã¯ç§ãä»åé¡ãèŠã€ããããšãã§ããŸããã以åã«èŠæ±ãããŸããïŒãããŠãŒãã£ãªãã£ããããä¿èšŒããã®ã«ååã§ãããã©ããã¯äžå¯èœã§ãã åé¡ã¯ãã¢ã¯ã»ãµã.d.tsã§éåžžã®ããããã£ãšåãããã«è¡šç€ºããããããéåžžã®ããããã£ãšåãããã«è¡šç€ºãããªãããšã§ãã ã€ãŸããã²ãã¿ãŒãšã»ãã¿ãŒã®éã«éãã¯ãªããããaïŒå®è£ ã§åäžã®ã€ã³ã¹ã¿ã³ã¹ã¡ã³ããŒã§ã¯ãªãã¢ã¯ã»ãµãŒã䜿çšããå¿ èŠããããbïŒã²ãã¿ãŒãšã»ãã¿ãŒã®ã¿ã€ãã®éããæå®ããæ¹æ³ã¯ãããŸããã
ãã³ãè¿ éãªè¿ä¿¡ããããšãããããŸãã ããŸããšã¬ã¬ã³ãã§ã¯ãªãæ¹æ³ã«åŸããŸãã çŽ æŽãããä»äºãããããšãïŒ
ããŸããŸãªã¿ã€ãã®JavaScriptã²ãã¿ãŒãšã»ãã¿ãŒã¯å®å
šã«æå¹ã§ãããããŸãæ©èœããŸããããããã®æ©èœã®äž»ãªå©ç¹/ç®çã§ãããšæããŸãã TypeScriptããããå°ç¡ãã«ããããã ãã«setMyDate()
ãæäŸããªããã°ãªããªãã
ãã®ãã¿ãŒã³ã«åŸãçŽç²ãªJSã©ã€ãã©ãªã«ã€ããŠãèããŠãã ããã.d.tsã¯ãŠããªã³ãŸãã¯any
ãå
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èŠããããŸãã
åé¡ã¯ãã¢ã¯ã»ãµãéåžžã®ããããã£ãšã¯ç°ãªãæ¹æ³ã§.d.tsã«è¡šç€ºãããªãããšã§ãã
次ã«ããã®å¶éãä¿®æ£ãããã®åé¡ãæªè§£æ±ºã®ãŸãŸã«ããŠããå¿ èŠããããŸãã
// MyClass.d.ts
// Instead of generating:
declare class MyClass {
myDate: moment.Moment;
}
// Should generate:
declare class MyClass {
get myDate(): moment.Moment;
set myDate(value: Date | moment.Moment);
}
// Or shorter syntax:
declare class MyClass {
myDate: (get: moment.Moment, set: Date | moment.Moment);
// and 'fooBar: string' being a shorthand for 'fooBar: (get: string, set: string)'
}
ããã¯åãªãæèŠã ãšæããŸããã a.x = y;
$ã®çŽåŸã«$ a.x === y
ãtrue
ã«ãªããªãããã«ã»ãã¿ãŒãæžãããšã¯ã巚倧ãªèµ€æã§ãã ãã®ãããªå³æžé€šã®æ¶è²»è
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JavaScriptã§ã¯çŽæçã§ã¯ãªãå¯èœæ§ããããTypeScriptã§ã¯ããŒã«ïŒIDE +ã³ã³ãã€ã©ïŒãæå¥ãèšããŸãã ãªãTypeScriptãåã³å¥œããªã®ã§ããïŒ :)
ããŸããŸãªã¿ã€ãã®JavaScriptã²ãã¿ãŒãšã»ãã¿ãŒã¯å®å šã«æå¹ã§ãããããŸãæ©èœããŸããããããã®æ©èœã®äž»ãªå©ç¹/ç®çã§ãããšæããŸãã
ããã¯ãJavaScriptã¯åŒ±ãåä»ãã§ãããããTypeScriptã¯åŒ±ãåä»ãã§ããå¿ èŠããããšäž»åŒµããŠããŸãã :-S
ããã¯ãJavaScriptã¯åŒ±ãåä»ãã§ãããããTypeScriptã¯åŒ±ãåä»ãã§ããå¿ èŠããããšäž»åŒµããŠããŸãã
CïŒã¯ãããèš±å¯ããããã¯ãã®èšèªã匱ãåä»ãããããã®ã«ããŸããCïŒã¯ç°ãªãåã®get/setãèš±å¯ããŸããã
CïŒã¯ãããèš±å¯ããããã¯ãã®èšèªã匱ãåä»ãããããã®ã«ããŸããCïŒã¯ç°ãªãåã®get/setãèš±å¯ããŸããã
ïŒãŠã£ã³ã¯ïŒ
ã¢ã¯ã»ãµãŒã¯åŒ±ãåä»ããããã¹ãã§ãããšïŒç§ãèŠãéãïŒäž»åŒµããŠãã人ã¯èª°ãããŸããã圌ãã¯ãåãå®çŸ©ããæè»æ§ãå¿ èŠã§ãããšäž»åŒµããŠããŸãã
å€ãã®å Žåããã¬ãŒã³ãªå€ããªããžã§ã¯ãããªããžã§ã¯ãã€ã³ã¹ã¿ã³ã¹ã«ã³ããŒããå¿ èŠããããŸãã
get fields(): Field[] {
return this._fields;
}
set fields(value: any[]) {
this._fields = value.map(Field.fromJson);
}
ããã¯ä»ã®æ¹æ³ãããã¯ããã«åªããŠãããç§ã®ã»ãã¿ãŒã¯ãç®çã®ããžãã¯ã»ãã¿ãŒã®æ£ç¢ºãªã¿ã€ããã«ãã»ã«åã§ããŸãã
@paulwalkerããã§äœ¿çšãããã¿ãŒã³ïŒ any
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@danquirkç¥ã£ãŠããã£ããããããšãïŒ STçšã®IDEãã©ã°ã€ã³ã³ã³ãã€ã©ãæŽæ°ããå¿ èŠããã£ãããã§ãã
@danquirkããã¯éã³å ŽïŒãŸãã¯ããŒãžã§ã³1.6.2ïŒã§ã¯æ©èœããªãããã§ãïŒ
http://www.typescriptlang.org/Playground#src =ïŒ
0AïŒ
0AclassïŒ
20FooïŒ
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7BïŒ
0AïŒ
0AïŒ
20ïŒ
20getïŒ
20itemsïŒïŒïŒ
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20itemsïŒvalueïŒ
3AïŒ
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typescript @ next ïŒããŒãžã§ã³1.8.0-dev.20151102ïŒã§ãã¹ããããšããããšã©ãŒãçºçããŸããã
~$ tsc --version
message TS6029: Version 1.8.0-dev.20151102
~$ cat a.ts
class A {
get something(): number {return 5;}
set something(x: any) {}
}
~$ tsc -t es5 a.ts
a.ts(2,2): error TS2380: 'get' and 'set' accessor must have the same type.
a.ts(3,2): error TS2380: 'get' and 'set' accessor must have the same type.
ç®èãªããšã«ãSublimeãªã³ã¿ãŒãæŽæ°ããåŸãTypeScript1.7.xã䜿çšããŠãããšã©ãŒãã¹ããŒãããªããªããŸããã ç§ã¯ããã1.7+ã§ä»åŸã®æ¡åŒµã§ãããšæã£ãŠããã®ã§ããããã1.8.0ã¯åŸéããŸããã
typescript1.7.5ããµããŒãããããŒãžã§ã³ã®VisualStudioCodeïŒ0.10.5ïŒ2015幎12æïŒïŒã䜿çšããtypescript 1.7.5ããã·ã³ã«ã°ããŒãã«ã«ã€ã³ã¹ããŒã«ããŠããããã¯äŸç¶ãšããŠåé¡ã§ãã
ã§ã¯ãããã¯ã©ã®ããŒãžã§ã³ã§ãµããŒããããŸããïŒ
ããããšã
ãã³ã¯ééã£ãŠãããšæããŸãã ã²ãã¿ãŒãšã»ãã¿ãŒã¯åãã¿ã€ãã§ããå¿ èŠããããŸãã
æ¥ã å床åšãã¹ãã§äœ¿çšããããŒãžãªããžã§ã¯ããäœæããå Žåã®åªããæ©èœã§ããã
å床åšãã¹ããæžãããšãã§ããã§ãããïŒ
po.email = "[email protected]";
expect(po.email).toBe("[email protected]");
...ããŒãžãªããžã§ã¯ããäœæããããšã«ãã£ãŠïŒ
class PageObject {
get email(): webdriver.promise.Promise<string> {
return element(by.model("ctrl.user.email")).getAttribute("value")
}
set email(value: any) {
element(by.model("ctrl.user.email")).clear().sendKeys(value);
}
}
ãã®ã³ãŒãã§ã¯ãã»ãã¿ãŒãany
ã¿ã€ãã§ããå¿
èŠããããŸããïŒ
ã²ãã¿ãŒã¯webdriver.promise.Promise<string>
ãè¿ããŸãããã»ãã¿ãŒã¯string
ã®å€ãå²ãåœãŠãŸãã
ãã¶ãã次ã®ããé·ã圢åŒã®å床åšãã¹ãã¯ãããããæ確ã«ããŸãïŒ
po.email = "[email protected]";
var currentEmail : webdriver.promise.Promise<string> = po.email;
expect(currentEmail).toBe("[email protected]")
@RyanCavanaugh nullã¢ãããŒã·ã§ã³ã®å°å ¥ã«ãããããã«ãããnullãæå®ããŠsetterãåŒã³åºããŠããã©ã«ãå€ã«èšå®ã§ããã³ãŒããé²æ¢ãããŸãã
class Style {
private _width: number = 5;
// `: number | null` encumbers callers with unnecessary `!`
get width(): number {
return this._width;
}
// `: number` prevents callers from passing in null
set width(newWidth: number | null) {
if (newWidth === null) {
this._width = 5;
}
else {
this._width = newWidth;
}
}
}
| null
ãš| undefined
ãååšããå Žåã«ãå°ãªããšãã¿ã€ããç°ãªãããããšãæ€èšã§ããŸããïŒ
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@artyilã¯éãããã_By Design_ã®ã¿ã°ãä»ããããŠããŸããããã¯ãçŸåšãè¿œå ããäºå®ããªãããšã瀺ããŠããŸãã äžèšã®æžå¿µãç¡å¹ã«ãããšæããã説åŸåã®ãããŠãŒã¹ã±ãŒã¹ãããå Žåã¯ãèªç±ã«ã±ãŒã¹ãäœæã§ããŸããè¿œå ã®ãã£ãŒãããã¯ã«ãããã³ã¢ããŒã ã¯åœŒãã®ç«å Žãåèããå¯èœæ§ããããŸãã
@kitsonkäžèšã®ã³ã¡ã³ãã§ã¯ãååãªæ°ã®èª¬åŸåã®ãããŠãŒã¹ã±ãŒã¹ãæäŸãããŠãããšæããŸãã çŸåšã®èšèšã¯ããã®å¶éã®ããä»ã®ã»ãšãã©ã®åä»ãèšèªã®äžè¬çãªãã¿ãŒã³ã«åŸããŸãããJavascriptã®ã³ã³ããã¹ãã§ã¯äžèŠã§ãããé床ã«å¶éãããŠããŸãã èšèšã«ãããã®ã§ãããèšèšãééã£ãŠããŸãã
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ããã«ã€ããŠããå°ãèããåŸã ããã§ã®åé¡ã¯ãå®éã«ã¯å®è£ ã®è€éãã ãšæããŸãã å人çã«ã¯@Arnavionã®äŸã¯é åçã ãšæããŸãããä»æ¥ã®åã·ã¹ãã ã¯ã²ãã¿ãŒ/ã»ãã¿ãŒãéåžžã®ããããã£ãšããŠæ±ããŸãã ãããæ©èœããã«ã¯ãäž¡æ¹ãåãå€ã§ããå¿ èŠããããŸãã èªã¿åã/æžã蟌ã¿ã¿ã€ãããµããŒãããããšã¯å€§ããªå€æŽã«ãªãã§ããããç§ã¯ããã®ãŠãŒãã£ãªãã£ãå®è£ ã³ã¹ãã®äŸ¡å€ããããã©ããããããŸããã
ç§ã¯TypeScriptã倧奜ãã§ãããŒã ãããã«æ³šãã ãã¹ãŠã®åªåã«æè¬ããŠããŸãïŒæ¬åœã«ãçããã¯çŽ æŽãããã§ãïŒïŒããç§ã¯ãã®æ±ºå®ã«å€±æããŠããããšãèªããªããã°ãªããŸããã getFoo()/setFoo()
ãŸãã¯get foo()/set foo()/setFooEx()
ã®ä»£æ¿æ¡ãããã¯ããã«åªãããœãªã¥ãŒã·ã§ã³ã«ãªããŸãã
åé¡ã®ã»ãã®çããªã¹ãïŒ
{ get foo(): string | number; set foo(): boolean }
ã¯$ïŒ { foo: boolean | string | number }
ïŒ$ã«å²ãåœãŠå¯èœã§ããããŸãã¯ãã®éã§ããïŒïŒæ£çŽãªãšãããç§ã¯ããã§ã³ãŒãã®æžãæ¹ã«ã€ããŠèŠç¯çã«ãªãããšãæ¬åœã«æ§ããããšããŠããŸãããç§ã¯ãã®ã³ãŒãããã®ã³ãŒãã§ãããšããèãã«æ¬åœã«å察ããŠããŸã
foo.bar = "hello";
console.log(foo.bar);
æ£ããã»ãã³ãã£ã¯ã¹ãæãããããšããèšèªã§"hello"
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èŠããããŸãã ããããã£ã¯ããã£ãŒã«ããšå€éšã®ãªãã¶ãŒããŒãåºå¥ã§ããªãåäœãããå¿
èŠããããŸãã
@RyanCavanaughæ³šå ¥ãããæèŠã«ã€ããŠããªãã«åæããŸãããç§ã¯_ãããããªã_ãéåžžã«TypeScriptyã§ãããšãã1ã€ã®åè«ãèŠãããšãã§ããŸã...ã»ãã¿ãŒã§åŒ±ãåã®äœããæããŸãããåžžã«åŒ·ãåã®äœããè¿ããšãããšãã°ïŒ
foo.bar = [ '1', 2 ]; // any[]
console.log(foo.bar); // number[]: [ 1, 2 ]
å人çã«ã¯ãããªãããããªã«éæ³ã®ããã«ãªãã®ããšæãåŸåããããŸããããšã³ãéçºè ãæ²ãã£ãããæããããŸããããåæããããããããšãæ確ã«ç解ã§ããããã«ãã¡ãœãããäœæããã®ãæåã§ãã
ãã®æ©èœã®äœ¿çšäŸã¯æ¬¡ã®ãšããã§ãã APIã¯ã_Autocasting_ãšããååã®æ©èœãå°å ¥ããŸããã äž»ãªå©ç¹ã¯ãã¿ã€ããæ確ã«å®çŸ©ãããŠããããããã£ãå²ãåœãŠãããã«ã€ã³ããŒãããã¯ã©ã¹ã®æ°ãæé€ã§ãããåçåãããéçºè ãšã¯ã¹ããªãšã³ã¹ã§ãã
ããšãã°ãcolorããããã£ã¯ã Color
ã€ã³ã¹ã¿ã³ã¹ãšããŠããŸãã¯rgba(r, g, b, a)
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åãšããŠè¡šçŸã§ããŸãã ããããã£ã¯ãå€ãèªã¿åããšãã«ååŸããã¿ã€ãã§ãããããåŒãç¶ãColor
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ããã«é¢ããããã€ãã®æ å ±ïŒ https ïŒ//developers.arcgis.com/javascript/latest/guide/autocasting/index.html
ãŠãŒã¶ãŒã¯ãã®æ©èœãå©çšããŠãå¿ èŠãªã€ã³ããŒãã®æ°ãæžãããå²ãåœãŠåŸã«ã¿ã€ããè¡ãå€æŽããããšãå®å šã«ç解ããŠããŸãã
ãã®åé¡ã®å¥ã®äŸïŒ https ïŒ//github.com/gulpjs/vinyl#filebase
file.base = 'd:\\dev';
console.log(file.base); // 'd:\\dev'
file.base = null;
console.log(file.base); // 'd:\\dev\\vinyl' (returns file.cwd)
ãããã£ãŠãã»ãã¿ãŒã¯string | null | undefined
ã§ãã²ãã¿ãŒã¯string
ã§ãã ãã®ã©ã€ãã©ãªã®åå®çŸ©ã§ã¯ã©ã®åã䜿çšããå¿
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getterãnullableãè¿ãããã«ãããããsetterãå ¥åãšããŠnullãèš±å¯ããŠã¯ãªããã次ã®ããã«å®ååãããŠããå¥ã®äŸããããŸãã
class Memory {
public location: string;
public time: Date;
public company: Person[];
}
class Person
{
private _bestMemoryEver: Memory | null;
public get bestMemoryEver(): Memory | null { // Might not have one yet
return this._bestMemoryEver;
}
public set bestMemoryEver(memory: Memory) { // But when he/she gets one, it can only be replaced, not removed
this._bestMemoryEver = memory;
}
}
var someDude = new Person();
// ...
var bestMemory: Memory | null = someDude.bestMemoryEver;
//...
someDude.bestMemoryEver = null; // Oh no you don't!
ã²ãã¿ãŒ/ã»ãã¿ãŒãnullã§ç°ãªãããã«ããããã®ç¹å¥ãªããžãã¯ãæ§ç¯ããã®ã¯å€§å€ãªäœæ¥ã«ãªãå¯èœæ§ãããããšãç解ããŠããŸããããã¯ç§ã«ãšã£ãŠããã»ã©å€§ããªåé¡ã§ã¯ãããŸããããæã£ãŠãããšäŸ¿å©ã§ãã
@ Elephant-Vesselå²åŠçã«ç§ã¯ãã®äŸã倧奜ãã§ããããã¯äººéã®æ°ãŸãããªæ§è³ªãããè¡šããŠããŸããã null
ïŒãŸãã¯undefined
ïŒãèš±å¯ããããšã«ãã£ãŠãããããã«è¯ãè¡šããããšã¯ç¢ºä¿¡ããŠããŸããïŒèšå®ããŸãã ã·ã¹ãã ã®ã·ããã¹é害ãã¢ãã«åããã«ã¯ã©ãããã°ããã§ããïŒ
@aluanhaddadãªãã·ããã¹ã®å€±æãå¿ èŠãªã®ã§ããïŒ ç§ã¯ç§ã®å®å®ã«ãã®ãããªæªããã®ãæãã§ããŸãã;ïŒ
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æ¶è²»è ãäºåã«nullãã§ãã¯ãããªããŠã¯ãªããªãããã«ããããããŸããã çŸåšãã»ãã¿ãŒãå¥ã®ã¡ãœããã«ããå¿ èŠããããŸãããåããã®ã«ããããšæããŸãã
以äžã¯ç§ã欲ãããã®ã§ãïŒ
export class TestClass {
private _prop?: number;
get prop(): number {
// return default value if not defined
this._prop === undefined ? 0 : this._prop;
}
set prop(val: number | undefined) {
this._prop = val;
}
}
null以å€ã®ãã§ãã¯ã®å©ç¹ãããããšã«ã¯èœãšãç©Žãããããã«æããŸãããããã¯ãã®1ã€ã§ãã å³å¯ãªnullãã§ãã¯ããªãã«ãããšãããã¯å¯èœã§ãããnullåç §ã®äŸå€ãé²ãããã®ã³ã³ãã€ã©ãŒã®ãã«ãã¯åŸãããŸããã ãã ããã³ã³ãã€ã©ã®æ¯æŽãå¿ èŠãªå Žåã¯ãå°ãªããšãnullå¯èœæ§ã«é¢ããŠãã²ãã¿ãŒãšã»ãã¿ãŒãå¥ã ã«å®çŸ©ãããªã©ãããå€ãã®ãµããŒããå¿ èŠã ãšæããŸãã
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@mhegazy @kitsonkåèŠããããããããŸããããããã¯ãç¹ã«nullãã§ãã¯ããŸã è¡ãããŠããªãèšèªã®ãããªä»ã®äžæ¬åŒ§ã§ãäžè¬çãªãã¿ãŒã³ã®å³å¯ãªnullãã§ãã¯ã§çºçãããã°ã ãšæããŸãã åé¿çã§ã¯ãã³ã³ã·ã¥ãŒããŒãbangæŒç®åã䜿çšããããå®éã«nullã«ãªããªãããšã確èªããå¿ èŠããããŸãïŒããã¯ãããã©ã«ãå€ã䜿çšããŠnullã«ãªããªããšããç¹ã§ãïŒã
å³å¯ãªnullãã§ãã¯ãè¿œå ãããšãæè¡çã«ç°ãªãã¿ã€ãã«ãªããããããã¯æ©èœããªããªããŸãã 匷åãªç°ãªãã¿ã€ããèšå®ããããã«æ±ããŠããããã§ã¯ãããŸãããããããæå¹ã«ããããã®èšèšèŠä»¶ã«ãã£ãŠã匷åãªç°ãªãã¿ã€ããæå¹ã«ãªãããã§ãã
匱ãåã«ã¯å¥ã®èšèšã䜿çšã§ããŸããããšãã°ãnullãundefinedãªã©ã®åã¯ãå®å šã«ç°ãªãåãæå¹ã«ããããªãå Žåã¯ãã€ã³ã¿ãŒãã§ã€ã¹å®çŸ©ãšd.tsãã¡ã€ã«ã«ç¹å¥ãªå ŽåããããŸãã
https://github.com/Microsoft/TypeScript/issues/2521#issuecomment-199650959ãžã®å¿ç
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export interface Test {
undefset prop1: number; // property [get] type number and [set] type number | undefined
nullset prop2: number; // property [get] type number and [set] type number | null
nilset prop3: number; // property [get] type number and [set] type number | null | undefined
undefget prop4: number; // property [get] type number | undefined and [set] type number
nullget prop5: number; // property [get] type number | null and [set] type number
nilget prop6: number; // property [get] type number | null | undefined and [set] type number
}
TypeScriptã«ç²ŸéããŠãããã®ã¹ã¬ãããèŠãŠãã人ãããããã§ãã®ã§ããŸã 泚æãæã£ãŠãã人ãé¢é£ãã質åã«çããããšãã§ãããããããŸããã ãã®Cesiumã®åé¡ã«ã€ããŠãããã§èª¬æããŠããget / setã¿ã€ãã®å¶éã«ã€ããŠèª¬æããŸããããŸããCesiumã®äººã ã¯ããã©ããŒããŠãããã¿ãŒã³ã¯CïŒããã®ãã®ã§ãããšèšããŸãããããã¯æé»ã®ã³ã³ã¹ãã©ã¯ã¿ãŒã§ãã
TypeScriptã¯æé»ã®ã³ã³ã¹ãã©ã¯ã¿ãŒããµããŒãã§ããŸããïŒ ã€ãŸãã myThing.foo
ã¯åžžã«Bar
Bar
ãçŽæ¥å²ãåœãŠãããšãã§ããŸããã number
ãå²ãåœãŠãããšãã§ããŸããéçºè
ã®äŸ¿å®ã®ããã«ãéãã«å
ãŸããŠ/ Bar
ãåæåããããã«äœ¿çšãããŸããïŒ Bar
ã«æ³šéãä»ããããã number
ã¯Bar<number>
ã«å²ãåœãŠå¯èœããšå
·äœçã«èšãããšã§ãããè¡ãããšãã§ããå Žåã¯ãCesiumã®åé¡ã§èª¬æãããŠãããŠãŒã¹ã±ãŒã¹ã«å¯Ÿå¿ããŸãããŸãããã®ã¹ã¬ããã§æèµ·ãããåé¡ã®å€ãã
ããã§ãªãå Žåã¯ãå¥ã®åé¡ã§æé»ã®ã³ã³ã¹ãã©ã¯ã¿ãŒã®ãµããŒããææ¡ããå¿ èŠããããŸããïŒ
èãããèªãã ãããã°ããã»ã©ããæé»ã®ã³ã³ã¹ãã©ã¯ã¿ãŒãã¿ãŒã³ãã«ã¯ãã®å·ã§èª¬æããæ©èœãå¿
èŠã«ãªããšç¢ºä¿¡ããŠããŸãã ããã©JSã§å¯èœãªå¯äžã®æ¹æ³ã¯ããªããžã§ã¯ãã®get / setã¢ã¯ã»ãµãŒã䜿çšããããšã§ããããã¯ãåç®äžã®å²ãåœãŠïŒ =
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èŠã«ãªããšæããŸã
class MyThing{
set foo(b: Bar<boolean> | boolean);
get foo(): Bar<boolean>;
}
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JavaScriptã¯ãããªããèšè¿°ãããã¿ãŒã³ããã§ã«èš±å¯ããŠããŸãã _challenge_ã¯ãTypeScriptã®åã®èªã¿åãåŽãšæžã蟌ã¿åŽããèšèšäžãåãã§ãããšæ³å®ãããŠããããšã§ãã å²ãåœãŠãçŠæ¢ããããã«èšèªã«å€æŽãå ããããŸããïŒ readonly
ïŒãã_æžã蟌ã¿ã®ã¿_ã®æŠå¿µãèŠæ±ããããã€ãã®åé¡ããããçŸå®äžçã®äŸ¡å€ãã»ãšãã©ãªãã»ã©è€éã§ãããšè°è«ãããŠããŸãã
IMOãJavaScriptãã¢ã¯ã»ãµãŒãèš±å¯ããŠä»¥æ¥ã人ã ã¯æœåšçã«ããããšæ··åããAPIãäœæããŠããŸããã å人çã«ã¯ãå²ãåœãŠã®äœãã_éæ³ã®ããã«_ä»ã®äœãã«å€ããã®ã¯çŽãããããšæããŸãã æé»çãªãã®ãç¹ã«åå€æã¯ãJavaScriptIMOã®æ©ã¿ã®çš®ã§ãã åé¡ãåŒãèµ·ããã®ã¯ãŸãã«æè»æ§ã§ãã _magic_ãååšãããããã®ã¿ã€ãã®å€æã§ã¯ãå人çã«ã¡ãœãããåŒã³åºãããã®ãèŠãã®ã奜ãã§ããããã§ã¯ãããçš®ã®âšãçºçããå€ãååŸããããã®èªã¿åãå°çšã²ãã¿ãŒãäœæããããšããã³ã³ã·ã¥ãŒããŒã«å¯ŸããŠããå°ãæ確ã«ãªããŸãã
ããã¯ãå®éã®äœ¿çšæ³ãååšããªãããšãæå³ãããã®ã§ã¯ãªããããã¯æœåšçã«æ£æ°ã§è«ççæ ¹æ ã§ãã åã·ã¹ãã å šäœã2ã€ã«åå²ããããšã¯è€éã§ãããšæããŸãããã®å Žåãåã¯èªã¿åããšæžã蟌ã¿ã®æ¡ä»¶ã§è¿œè·¡ããå¿ èŠããããŸãã ããã¯éåžžã«éèŠãªã·ããªãªã®ããã§ãã
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ã¯ããã䜿çšããŠããŸãã ç°ãªãã¿ã€ããset/get
ãã¢ã«å²ãåœãŠãæ©èœããªãã®ã«ããªãã¢ã³ããšã³ãã¿ã€ãã³ã°ã«set/get
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èŠã¯ãããŸããã ïŒæããã«ãå®éã®TypeScriptã³ã³ãã€ã«ã¯ãŸã£ããå¥ã®ãã®ã§ããïŒ
@ thw0rted
TypeScriptã«ç²ŸéããŠãããã®ã¹ã¬ãããèŠãŠãã人ãããããã§ãã®ã§ããŸã 泚æãæã£ãŠãã人ãé¢é£ãã質åã«çããããšãã§ãããããããŸããã ãã®Cesiumã®åé¡ã«ã€ããŠãããã§èª¬æããŠããget / setã¿ã€ãã®å¶éã«ã€ããŠèª¬æããŸããããŸããCesiumã®äººã ã¯ããã©ããŒããŠãããã¿ãŒã³ã¯CïŒããã®ãã®ã§ãããšèšããŸãããããã¯æé»ã®ã³ã³ã¹ãã©ã¯ã¿ãŒã§ãã
CïŒã®æé»çãªãŠãŒã¶ãŒå®çŸ©ã®å€ææŒç®åã¯ãå€ã®ã¿ã€ãã«åºã¥ããŠéçã³ãŒãçæãå®è¡ããŸãã TypeScriptã¿ã€ãã¯æ¶å»ãããå®è¡æã®åäœã«ã¯åœ±é¿ããŸããïŒ$ Promise
ããªãã£ã©ãŒã®async
/ await
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@kitsonkç§ã¯ããããã£ã«é¢ããŠäžè¬çã«å察ããªããã°ãªããŸããã JavaãC ++ãããã³CïŒã§ããªãã®æéãè²»ãããŠããã®ã§ãããããã£ïŒCïŒã§èŠãããããã«ïŒã¯éèŠãªæ§æã®æœè±¡åãæäŸããããïŒããã¯JavaScriptã§ãããçšåºŠåœãŠã¯ãŸããŸãïŒã絶察ã«å€§å¥œãã§ãã ãããã«ãããã€ã³ã¿ãŒãã§ãŒã¹ã¯ãæ§æãå€æŽããããšãªããæå³ã®ããæ¹æ³ã§èªã¿åã/æžã蟌ã¿æ©èœãåé¢ã§ããŸãã X
ãååŸãããšãã«ã getX()
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èªã¿åãå°çšã§ããããäžéšã®ããŒã¿ïŒããšãã°ã registry
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interface Entry {key: string; value: any;}
export function createRegistry() {
let entries: Entry[] = [];
return {
register(key: string, value: any) {
entries = [...entries, {key, value}];
},
get entries() {
return [...entries];
}
}
}
const registry = createRegistry();
registry.register('hello', 'æšå¥œ');
console.log(registry.entries); //[{key: 'hello', value: 'æšå¥œ'}]
registry.register('goodbye', 'åè§');
console.log(registry.entries); //[{key: 'hello', value: 'æšå¥œ'}, {key: 'goodbye', value: 'åè§'}]
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javascriptãããžã§ã¯ããtypescriptã«ç§»æ€ããŸãã ç§ã¯ãã®åé¡ã«ééããŸããã
ããã¯ãAngular @Inputãã³ã¬ãŒã¿ã§äœ¿çšãããšäŸ¿å©ã§ãã å€ã¯ãã³ãã¬ãŒãããæž¡ããããããç§ã®æèŠã§ã¯ãããŸããŸãªçä¿¡ãªããžã§ã¯ãã¿ã€ããåŠçããæ¹ãã¯ããã«ã¯ãªãŒã³ã«ãªããŸãã
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import { Component, Input } from '@angular/core';
import { flatMap, isString, isArray, isFalsy } from 'lodash';
@Component({
selector: 'app-error-notification',
templateUrl: './error-notification.component.html',
})
export class ErrorNotificationComponent {
private _errors: Array<string> = [];
constructor() { }
/**
* 'errors' is expected to be an input of either a string or an array of strings
*/
@Input() set errors(errors: Array<string> | any){
// Caller just passed in a string instead of an array of strings
if (isString(errors)) {
this._errors = [errors];
}
// Caller passed in array, assuming it is a string array
if (isArray(errors)) {
this._errors = errors;
}
// Caller passed in something falsy, which means we should clear error list
if (isFalsy(errors)) {
this._errors = [];
}
// At this point just set it to whatever might have been passed in and let
// the user debug when it is broken.
this._errors = errors;
}
get errors() {
return this._errors;
}
}
ããã§ãç§ãã¡ã¯ããã§ãããïŒ ã»ãã¿ãŒãšã¯éãã¿ã€ãã®ã²ãã¿ãŒãè¿ãå¯èœæ§ãæ¬åœã«æã£ãŠãããã§ãã äŸãã°ïŒ
class Field {
private _value: string;
get value(): string {
return this._value;
}
set value(value: any) {
this._value = String(value);
}
}
ããã¯ããã€ãã£ãå®è£
ã®99ïŒ
ãè¡ãããšã§ãïŒ (input as HTMLInputElement).value
ã«æ°å€ãæž¡ããšãåžžã«æååãè¿ãããŸããå®éãgetãšsetã¯ã¡ãœãããšèŠãªãããããã€ããèš±å¯ããå¿
èŠããããŸãã
set value(value: string);
set value(value: number);
set value(value: any) {
this._value = String(value);
}
// AND/OR
set value(value: string | number) {
this._value = String(value);
}
@raysuelzerã¯ãã³ãŒãããæ©èœããããšèšã£ãå Žåã ErrorNotificationComponent.errors
ã¯Array<string> | any
ã®ã¿ã€ããè¿ããŸãããïŒ ã€ãŸããå®éã«Array<string>
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圌ãã¯ä»¥åã«éããããäž»é¡ãåèããŸãã åé¡ã®äžéšã«ðãæäŸããããšã¯ããããæå³ã®ãããã®ã§ãããšããä¿¡ææ§ããããããŸãã åã·ã¹ãã ã¯ãã¹ãŠã®èªã¿åããšæžã蟌ã¿ã§åå²ããå¿ èŠãããããšãæå³ãããããäžè¬çã«ãè€éããããã«ããŽãªã«åé¡ããããšæããŸãããã®æèŠã¯ããããå ¥ããŠäœãæºè¶³ãããããšããåªåãšã³ã¹ãã ãšæããŸããæå¹ã§ãããããçãããŠãŒã¹ã±ãŒã¹ã¯äŸ¡å€ããããŸããã
ç§ã®å人çãªææ³ã¯ãç¹ã«ãã®ãã¿ãŒã³ãå¹æçã«äœ¿çšããæ¢åã®JavaScriptã³ãŒããã¢ãã«åã§ããããšã¯ã_æã£ãŠãããšããããšã§ã_ã
å人çã«ã¯ãã¬ã¬ã·ãŒJSã®åé¡ã«å¯ŸããŠããŸã£ããé¢åã§ã¯ãªãåé¿çãèãåºãã°ãåé¡ã¯è§£æ±ºãããšæããŸãã ç§ã¯ãŸã TSã°ãªãŒã³ããŒã³ã®ãããªãã®ãªã®ã§ãããããç§ã®çŸåšã®ãœãªã¥ãŒã·ã§ã³ïŒåŒ·å¶ãã£ã¹ããŸãã¯äžèŠãªã¿ã€ãã¬ãŒãïŒã¯æ¢åã®æ©èœã®æé©ãªäœ¿çšã§ã¯ãããŸãããïŒ
åæã ã¿ã€ããåãã§ãªããã°ãªããªãå Žåã setter
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get price() {
return (this._price as number);
}
set price(price) {
this._price = typeof price === 'string' ? parseFloat(parseFloat(price).toFixed(8)) : parseFloat(price.toFixed(8));
}
ä¿åãããå€ãæ°å€ã«ãããã®ã§ãããæååããã»ãã¿ãŒã§floatã«å€æãããã®ã§ãããããã£ãèšå®ãããã³ã«parseFloatãå®è¡ããå¿ èŠã¯ãããŸããã
è©æ±ºã¯ããããæå¹ãªïŒãŸãã¯å°ãªããšãåççã«åãå ¥ããããŠããïŒJavascriptãã¿ãŒã³ã§ãããTypescriptã®å éšã«ããŸãé©åããªããšããããšã ãšæããŸãã å éšã®å€æŽãããŸãã«ã倧ããªå€æŽã§ããå ŽåãTSãå éšã§ã³ã³ãã€ã«ããæ¹æ³ãå€æŽããããçš®ã®æ³šéãååŸã§ããŸããïŒ äœãã®ãããªãã®
class Widget {
get price(): number | /** <strong i="7">@impossible</strong> */ string | undefined { return this._price; }
set price(val: number|string|undefined){ ... }
}
let w = new Widget();
w.price = 10;
// Annotation processes as "let p:number|undefined = (w.price as number|undefined)"
let p: number|undefined = w.price;
èšãæãããšãTSãJSã«ãã©ã³ã¹ãã€ã«ãããåã«ãããªããã»ããµïŒïŒïŒãw.price
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ã¯åžžã«åãå€æ°ã¿ã€ããè¿ãã¯ããªã®ã§ãããã§ååã§ããã
class Widget {
get price(): number { return this._price; }
set price(val){ return this.setPrice(val); } // call another function
// do processing here
private setPrice(price: number | string): number {
let num = Number(price);
return isNaN(num) ? 0 : num;
}
}
@iamjoyce widget.price = '123'
ã¯ãã³ãŒãã§ã³ã³ãã€ã«ãšã©ãŒãçºè¡ããŸã
@iamjoyce =>ã³ã³ãã€ã©ã$ïŒ$ 1 $ïŒ$ã§set price(val)
val: number
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private _someProperty: SomeEnum;
set someProperty(value: SomeEnum | string) {
this._someProperty = this.coerceSomeEnum(value);
}
get someProperty(): SomeEnum {
return this._someProperty;
}
ä»æ¥ãããã¯| string
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interface SomeNestedString {
foo: string;
}
...
private _foo: SomeNestedString | string;
get foo(): SomeNestedString | string {
return this._foo;
}
set foo(value: SomeNestedString | string) {
this._foo = (value as SomeNestedString).foo;
}
ç§ã¯ãããç®åã®åé¡ãåé¿ãããšã¯æããªãã å®éã«ã¯ãgetterã¯å ±çšäœåã®ãµãã»ããããè¿ããªãã«ãããããããgetterã䜿çšãããšãã¯ãåã¬ãŒããå¿ èŠã§ãã
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export class FooBar {
private bar: string;
get foo (): string | any {
return this.bar;
}
set foo (value: Date | string | any) {
// Type guarding enables IntelliSense in VS Code
if (value instanceof Date) {
this.bar = value.toISOString();
} else if (typeof value === 'string') {
this.bar = value;
} else {
this.bar = String(value); // Or throw an error
}
}
}
@jpidelatorreãã®ããã«ãããšãåã®å®å šæ§ã倱ãããŸãã
const fooBar = new FooBar()
const a: number = fooBar.foo // works while it should fail
fooBar.foo = 123 // fails only at runtime, not compile time. It doesnt fail in this particular case with strings and numbers, but it will with something more complex
@keenondrumsã ãããããã¢ã¯ã»ãµãŒã«ããŸããŸãªã¿ã€ããæããããã®ã§ãã ç§ãèŠã€ããã®ã¯åé¿çã§ããã解決çã§ã¯ãããŸããã
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export class FooBar {
private bar: string;
get foo (): string {
return this.bar;
}
setFoo (value: Date | string ) {}
}
@keenondrumsã¢ã¯ã»ãµãŒã»ã©èŠæ ãã¯è¯ããããŸãããããããŸã§ã§æé«ã®ãªãã·ã§ã³ã§ãã
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class Foo {
get bar:()=>number;
set bar:number;
}
const foo = new Foo();
foo.bar = 3;
foo.bar(); // 3
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interface IFoo {
bar: string;
}
class Foo implements IFoo {
bar: string;
toString():string;
}
class Example {
get foo:Foo;
set foo:Foo|IFoo;
}
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foo.bar = "hello"; console.log(foo.bar);
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private _employeeIdListïŒnumber []
get EmployeeIDListïŒïŒïŒnumber [] {
this._employeeIdListãè¿ããŸã;
}
set EmployeeIDListïŒ_idListïŒ any ïŒ{
ifïŒtypeof _idList =='string'ïŒ{
this._employeeIdList = _idList.splitïŒ'ã'ïŒãmapïŒd => NumberïŒdïŒïŒ;
}
else ifïŒtypeof _idList =='object'ïŒ{
this._employeeIdList = _idList as number [];
}
}
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any
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ãä¿èšŒãããããã§ã¯ãããŸããã
element.scrollTop = -100;
element.scrollTop; // returns 0
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TypeScriptã䜿çšãããšãäžéšã®ããããã£ã§åãå ¥ãå¯èœãªåãç·©åããAPIãæ£ç¢ºã«èšè¿°ã§ããã®ã¯ãã°ãããããšã§ããããã®å©ç¹ã¯ãã²ãã¿ãŒã®æ»ãåãå€å¥ããããã«é床ã®åãã§ãã¯/ä¿è·ãå¿ èŠãªããäžæ¹ã®ç«¯ã®æ©æŠã«ãã£ãŠæãªãããŸãã ãããã¯_specify_ããããšããå§ãããŸãã
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type urlRep = string | Url;
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ãããŠãç§ã¯ãã»ãã¿ãŒ/ã²ãã¿ãŒã_disjoint_ã¿ã€ããæã€ããšã誰ãæãã§ããªããšæããŸãã ããã§èª¬æããŠããã®ã¯ãAPIãããã¥ãŒãµãŒãAPIã³ã³ã·ã¥ãŒããŒã«å¯ŸããŠãã²ãã¿ãŒãã»ãã¿ãŒã®å ±çšäœåã®å³å¯ãªãµãã»ããã§ããåã®å€ãè¿ãããšãè¡šæããããšã§ãã
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ããã«å¯ŸæããèŠç¹ãæäŸããããã ãã«ã setter / getterã«äºãã«çŽ ãªåã䜿çšããããšã¯ãjavascriptã§ã¯å®å šã«åæ³ã§ãããããç§ã¯ééããªããããæãã§ããŸãã ãããŠãç§ã¯ãäž»ãªç®æšã¯ãJavaScriptã§åæ³ã§ãããã®ïŒå°ãªããšã.d.tsã¬ãã«ã§ïŒãæ£ããå ¥åããã®ã«ååãªè¡šçŸåã®ããåã·ã¹ãã ã«ããããšã§ããã¹ãã ãšæããŸãã ããã¯è¯ãç¿æ £ã§ã¯ãªãããšãç解ããŠããŸããããšãã°ãã°ããŒãã«ãªããžã§ã¯ãããé¢æ°ãªã©ã®çµã¿èŸŒã¿ã®ãããã¿ã€ããå€æŽããããšãã§ããŸãããã.d.tsãã¡ã€ã«ã«åé¡ãªãå ¥åããããšã¯ã§ããŸããããããåŸæããŠãã人ã¯èª°ãããŸãããç§ãã¡ã¯ãããè¡ãããšãã§ããŸãïŒããã¯ããã€ãã®äžååã«èšèšãããåå®çŸ©ãã¡ã€ã«ã確å®ã«åä»ãããããã®ã«è¡šç€ºãããŸããïŒã
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class Vector3 { /* ... */ }
type XYZ = Vector3 | [number, number, number] | {x: number, y: number, z: number}
type PropertyAnimator = (x: number, y: number, z: number, timestamp: number) => XYZ
type XYZSettables = XYZ | PropertyAnimator
export class Transformable {
// ...
set position(newValue: XYZSettables) {
this._setPropertyXYZ('position', newValue)
}
get position(): Vector3 {
return this._props.position
}
// ...
}
ãæ³åã®ãšããã䜿çšæ³ã¯éåžžã«æè»ã§ãã
const transform = new Transformable
// use an array
transform.position = [20, 30, 40]
// use an object
transform.position = {y: 30, z: 40} // skip `x` this time
// animate manually, a property directly
requestAnimationFrame((time) => {
transform.position.x = 100 * Math.sin(time * 0.001)
})
// animate manually, with an array, which could be shared across instances
const pos = [10, 20, 30]
requestAnimationFrame((time) => {
pos[2] = 100 * Math.sin(time * 0.001)
transform.position = pos
})
// Animate with a property function
transform.position = (x, y, z, time) => [x, y, 100 * Math.sin(time * 0.001)]
// or a simple increment:
transform.position = (x, y, z) => [x, y, ++z]
// etc
// etc
// etc
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TypeScriptã®è¡šçŸåã·ã¹ãã ã§ããIMOã¯ã2ã€ã®å¥åã®ç®çãæãããŸãã 1ã€ç®ã¯ãããå®å šãªæ°ããã³ãŒããèšè¿°ã§ããããã«ããããšã§ãã ãããŠããããå¯äžã®ç®çã§ããå Žåã¯ããã®ã·ããªãªãèš±å¯ããªãå Žåã¯ã³ãŒãã®æ¹ãå®å šã§ããå¯èœæ§ãããããããã®ãŠãŒã¹ã±ãŒã¹ãåé¿ã§ãããšããè°è«ãè¡ãããšãã§ããŸãïŒãã ããããã«ã€ããŠã¯ãŸã è°è«ã§ãããšæããŸãïŒã
ãã ãã2çªç®ã®ç®çã¯ãã©ã€ãã©ãªã®åäœããã®ãŸãŸãã£ããã£ããããšã§ãããDOMããã³JSã©ã€ãã©ãªã§ã¯ãã»ãã¿ãŒã§èªå匷å¶ããã²ãã¿ãŒã§1ã€ã®äºæãããåãè¿ãã®ãããªãäžè¬çãªæ¹æ³ã§ãã ãããåã·ã¹ãã ã§ãã£ããã£ã§ããããã«ããããšã§ãæ¢åã®ãã¬ãŒã ã¯ãŒã¯ãããæ£ç¢ºã«èšè¿°ã§ããããã«ãªããŸãã
å°ãªããšããããã§Design Limitation
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https://stackoverflow.com/questions/57948140/typescript-proxy-which-returns-a-different-type-from-get-than-it-takes-for-set
ããã¯æããã«ãïŒ33749ããšã«.style.display = ...something nullable...
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ç§ã¯ãŸãããããžã®éãèŠã€ããããšã«èå³ããããŸãã ã¢ã³ããšã³ãã³ã³ããã¹ãã§ã®ã¿èš±å¯ãããå Žåã¯ã©ããªããŸããïŒ @RyanCavanaughã¯ãè€éãã®æžå¿µã«å¯ŸåŠããã®ã«åœ¹ç«ã¡ãŸããïŒ
ããã®ç§ã®ãŠãŒã¹ã±ãŒã¹ã¯ããããã·ãpromiseãè¿ãAPIãæã£ãŠããŸãããsetæäœã¯promiseãèšå®ããŸããã çŸåšãTypeScriptã§ããã説æããããšã¯ã§ããŸããã
let post = await loadPost()
let user = await loadUser()
post.author = user // Proxy handles links these two objects via remote IDs
await save(post)
// Somewhere else in code
let post = await loadPost()
let author = await post.author
ã¿ã€ããä¿®æ£ãããã€ãã£ãé¢æ°ã§ããããšãäžè¬çãªãããã·ã§ããããšãTypeScriptã¯ããããã®ã¿ã€ãã®æ©èœãééãã§ãã£ããšããã¹ã¿ã³ã¹ã®ããã§ãã
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setã¡ãœããã®é
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šäœãååŸããããšæããŸãã ä»ã®ãšãããæ£åžžã«æ©èœããset myArray(...value: string[])
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èŠããããŸãã ãã®åé¡ã«å€ãã®åé¡ãæ±ããŠããŸã...ãããåé€ããããšãæ€èšããŠãã ããã æ
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class MyClass {
_myArray: string[] = [];
set myArray(value: string) {
this._myArray.push(value);
}
get myArray(): string[] {
return this._myArray;
}
}
class MyClass {
_myArray: string[] = [];
set myArray(...value: string[]) {
this._myArray.push(value[0]);
}
get myArray(): string[] {
return this._myArray;
}
}
ãããå¿
èŠã«ãªã£ããšãã«æãã€ãã解決çã®1ã€ã¯ãããããã£ãunion type
ã«èšå®ããããšã§ããã ããã¯ãç§ã®æéãAPIããæååãšããŠå
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èŠããããŸãã
class TimeStorage {
_startDate: string | Moment = ""
_endDate: string | Moment = ""
set startDate(date: Moment | string) {
this._startDate = moment(date).utc()
}
get startDate(): Moment | string {
return moment.utc(this._startDate)
}
set endDate(date: Moment) {
this._endDate = moment.utc(date)
}
get endDate() {
return moment.utc(this._endDate)
}
}
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class Foo {
constructor() {
this._bar = '';
this.baz = '';
}
// error: 'get' and 'set' accessor must have the same type.(2380)
get bar(): string {
return this._bar;
}
// error: 'get' and 'set' accessor must have the same type.(2380)
set bar(value: string | number) {
this._bar = value.toString();
}
public baz: string;
private _bar: string;
}
ããã¯äžå¯èœã§ããã匷ãåä»ããå¿ èŠãªãããè¿œå ã®ã³ãŒããå¿ èŠã§ãã ããã§ããã®äŸã®ç®çã®ããã«ã誰ãã次ã®ãããªããããã£ã©ã€ãã©ãªãäœæãããšããŸãããã
/**
* Abstract base class for properties.
*/
abstract class Property<GetType, SetType> {
abstract get(): GetType;
abstract set(value: SetType): void;
}
/**
* Proxify an object so that it's get and set accessors are proxied to
* the corresponding Property `get` and `set` calls.
*/
function proxify<T extends object>(obj: T) {
return new Proxy<any>(obj, {
get(target, key) {
const prop = target[key];
return (prop instanceof Property) ? prop.get() : prop;
},
set(target, key, value) {
const prop = target[key];
if (prop instanceof Property) {
prop.set(value);
} else {
target[key] = value;
}
return true;
}
});
}
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class Bar extends Property<string, string | number> {
constructor(bar: string | number) {
super();
this.set(bar);
}
get(): string {
return this._bar;
}
set(value: string | number) {
this._bar = value.toString();
}
private _bar: string;
}
class Foo {
constructor() {
this.bar = new Bar('');
this.baz = '';
}
public bar: Bar;
public baz: string;
}
ãããŠããã®ã¯ã©ã¹ã䜿çšãããšãã¿ã€ãã»ãŒããªã²ãã¿ãŒãšã»ãã¿ãŒãbar
ãªããŸãã
const foo = new Foo();
// use property's typed setter
foo.bar.set(42);
foo.baz = 'foobar';
// use property's typed getter
// output: 42 foobar
console.log(foo.bar.get(), foo.baz);
ãŸããããããã£ã»ãã¿ãŒãŸãã¯ã²ãã¿ãŒãããåçã«äœ¿çšããå¿
èŠãããå Žåã¯ã proxify
é¢æ°ã䜿çšããŠãããã©ããã§ããŸãã
const foo = new Foo();
// use proxified property setters
Object.assign(proxify(foo), { bar: 100, baz: 'hello world' });
// use property's typed getter
// output: 100 hello world
console.log(foo.bar.get(), foo.baz);
// use proxified property getters
// output: {"bar":"100","baz":"hello world"}
console.log(JSON.stringify(proxify(foo)));
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ãããæ¶ç©ºã®ã©ã€ãã©ãªã«è¿œå ãããšã次ã®ããã«ãªããŸãã
/**
* Create a property with custom `get` and `set` accessors.
*/
function property<GetType, SetType>(property: {
get: () => GetType,
set: (value: SetType) => void
}) {
const obj = { ...property };
Object.setPrototypeOf(obj, Property.prototype);
return obj;
}
å
ã®ã¯ã©ã¹ã«å°ãè¿ãå®è£
ãååŸããæãéèŠãªã®ã¯this
ã«ã¢ã¯ã»ã¹ã§ããããšã§ãã
class Foo {
constructor() {
this._bar = '';
this.baz = '';
}
public bar = property({
get: (): string => {
return this._bar;
},
set: (value: string | number) => {
this._bar = value.toString();
}
});
public baz: string;
private _bar: string;
}
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`` ``
ã¯ã©ã¹SubmitButton{
private _disabledïŒboolean;
disableïŒïŒãååŸããŸãïŒboolean {
this._disabledãè¿ããŸãã
}
set disableïŒvalueïŒbooleanïŒ{
this._disabled =ïŒvalue ===''ïŒ|| 䟡å€;
}
static ngAcceptInputType_disabledïŒboolean |'';
}
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export const enum Conns {
none = 0, d = 1, u = 2, ud = 3,
r = 4, rd = 5, ru = 6, rud = 7,
l = 8, ld = 9, lu = 10, lud = 11,
lr = 12, lrd = 13, lru = 14, lrud = 15,
total = 16
}
class Tile {
public connections = Conns.none;
get connLeft() { return this.connections & Conns.l; };
set connLeft(val: boolean) { this.connections = val ? (this.connections | Conns.l) : (this.connections & ~Conns.l); }
}
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ã®è©³çŽ°ã§ãã OPã®äŸã§ã¯ãæçµçã«type MyClass = { myDate(): moment.Moment; }
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