ããã¯å ã 1ã€ã®ç¹å®ã®èª²é¡ã®ããã«éãããŸãããããã®ã»ã¯ã·ã§ã³ã®éäžã§ä»ã®ããã€ãã®ããšã«æ°ä»ããã®ã§ããã®1ã€ã®åé¡ïŒããããã®ã³ã¡ã³ãïŒã«ããããçµ±åããŸãã @HKuz ããããããã§ã«å¥ã®åé¡ãããå Žåã¯ãããªããç¥ã£ãŠãããšæããŸããç°¡åã«æ€çŽ¢ããŸããããäœãèŠã€ãããŸããã§ããã
å šäœçã«-ãããã®èª²é¡ã¯çŽ æŽããããšæããŸãïŒ _ééããªã_æ¢åã®OOPã»ã¯ã·ã§ã³ã«å¯Ÿãã_äž»èŠãª_æ¹å!!!! ããããäœæãã人ã«ã¯ãããã£ãïŒ
ãã®èª²é¡ã¯ã解決çãšããŠä»¥äžã®ã¿ãåãå ¥ããŸãã
console.log(dog.name);
console.log(dog.numLegs);
ãã ãã2ã€ã®å¥åã®ã¹ããŒãã¡ã³ãã䜿çšããå¿ èŠãããããšãæ瀺çã«è¿°ã¹ãŠãããã以äžã¯åæ ŒããŸããã
console.log(dog.name, dog.numLegs);
2ã€ã®å¥ã
ã®console.log()
ã¹ããŒãã¡ã³ããäœæããå¿
èŠãããããšãæå®ããããäž¡æ¹ã®ãœãªã¥ãŒã·ã§ã³ãåãå
¥ããããã«ãã¹ãããªãã¡ã¯ã¿ãªã³ã°ããå¿
èŠããããšèããŠããŸããåŸè
ã®ãªãã·ã§ã³ããå§ãããŸãã èãïŒ
myHouse instanceof House;
ãæžã蟌ãŸãããšããªã³ã¿ãŒã¯èŠåExpected an assignment of function call and instead saw an expression
ã¹ããŒããŸãã ããããææŠã¯ééããŸããfunction House(numBedrooms) {
this.numBedrooms = numBedrooms;
}
ãããããã®ãã£ã¬ã³ãžã§ã¯ã次ã®æ§æã«åãæ¿ããŸãã
let House = function(numBedrooms) {
this.numBedrooms = numBedrooms;
}
ããã¯ãæ··ä¹±ã®åå ãšãªãå¯èœæ§ãããã»ã©ã®åé¡ã§ã¯ãããŸããã äž¡æ¹ã®æ¹æ³ã䜿çšããå Žåã¯ãéãã«ç¹ã«æ³šæããå¿ èŠããããšæããŸãããã以å€ã®å Žåã¯ãã»ã¯ã·ã§ã³å šäœã§æ§æã®äžè²«æ§ãä¿ã€ã ãã§ãã ããããäž¡æ¹ãå°å ¥ããã®ã¯è¯ãèãã ãšæããŸããã
ã¡ããã©ãã®1ã®èŠ³å¯ãããã³ãã®ä»ã®æèŠãäœã§ããããèŠãããã«å¥œå¥å¿-ãããããã®èª²é¡ã¯ãããå€ãã®åšãã®ããããå
¬è»¢ããŠããããã for...in
ã§ã¯ãªãhasOwnProperty
ãããã³for...in
ãããŸããçŸæç¹ã§ã¯ããã®ã»ã¯ã·ã§ã³ã§ååã«èª¬æãããŠããŸãã
人ã
ãæ®ãã®ã«ãªãã¥ã©ã ãå®äºãããšä»®å®ãããšãããã¯å°ãªããšãåºæ¬çãªããŒã¿æ§é ã®ã»ã¯ã·ã§ã³ã§ã«ããŒãããŠããã®ã§ãããã§åé¡ãªããšæããŸãããã»ã¯ã·ã§ã³ãäºãã«ç¬ç«ãããåææ¡ä»¶ãå¿
èŠãšããªãå Žåã¯ããããåæ€èšããããããããŸãããïŒ
ãã®èª²é¡ã¯ã次ã®ããããã®ãœãªã¥ãŒã·ã§ã³ã§åæ ŒããŸãã
function joinDogFraternity(candidate) {
if (candidate instanceof Dog) {
return true;
}
return false;
}
// OR:
function joinDogFraternity(candidate) {
if (candidate.constructor === Dog) {
return true;
}
return false;
}
æ¬èœã¯äººã ã圌ãã«ææ¡ããã解決çãæåã«è©Šãããšãæ瀺ããã®ã§ãç§ã¯ããã倧ããªåé¡ã§ãããšã¯æããªãããç¥èã®ãããã£ã³ããŒãäž¡æ¹ã®æ¹æ³ãè©Šã¿ãŠãããããšæã£ããšãã«ãããéãããåé¡ã§ããããšãããããããææããŠãã ããã
"message: 'your solution should use the constructor property'"
ãšãããã¹ãã±ãŒã¹ãè¿œå ããŠãæ£èŠè¡šçŸã§æ€èšŒããã ãã§ãã
ãã®èª²é¡ã¯å°ãçŽãããããšæããŸãã ã¿ã€ãã«ã¯ç¶æ¿ãæããŸãããç¶æ¿ã¯ãã£ã¬ã³ãžã§èšåãããããšã¯ãããŸãã-ç¶æ¿ã¯æ¬¡ã®ãã£ã¬ã³ãžã«é¢é£ããŠããããšãèªèããŠããã®ã§ããã£ã³ããŒã¯ããã«ããããŸããããã®æ瀺æ¹æ³ã¯ãŸã å°ãäžå¿«ã§ãã ãŸãããã£ã¬ã³ãžã®æåŸã«Animal
ã¹ãŒããŒã¿ã€ããäœæããŸããããçŸæç¹ã§ã¯Animal
ãCat
é¢é£ä»ããããŠããªããããå°ãæ··ä¹±ããŠããŸãã Dog
ã æ··ä¹±ãå°ãåãããããã«ãå°ãå€æŽãå ããããšãã§ãããšæããŸãã
ãã®ãã¬ãŒãºã¯æ¬¡ã®ææŠããæ¥ãŠããŸãïŒ
ãã®èª²é¡ãšæ¬¡ã®èª²é¡ã§ã¯ãBird andDogå ã§Animalã®ã¡ãœãããåå®çŸ©ããã«åå©çšããæ¹æ³ã«ã€ããŠèª¬æããŸãã ç¶æ¿ãšåŒã°ããææ³ã䜿çšããŸãã
ãããããç©äºãçµã³ä»ããããã«ãããã«äŒŒãããé«ãã¬ãã«ã®æŠèŠãã代ããã«ãã®ãã£ã¬ã³ãžã§äžããããšãã§ããŸãããã®ãã£ã¬ã³ãžã§ã¯ã3ã€ãã¹ãŠãçµã³ä»ããŠãããããã·ãŒã±ã³ã¹ã§ããããšãç解ãããå®éã«ãã£ã¬ã³ãžã®ã¿ã€ãã«ã®åŸã«ä»ããããæŠå¿µãå°å ¥ããŠããã®ãã£ã¬ã³ãžã®çµããã«ã¯ããŸã å®äºããŠããªãããšãæ確ã«ããŸãã
ããã§ã®è¶ ãã€ããŒãªåé¡-ãã®ã·ãŒãã®äžéšã¯æ¬¡ã®ããã«ãªããŸãã
// Add your code below this line
let duck
let beagle
duck.eat(); // Should print "nom nom nom"
beagle.eat(); // Should print "nom nom nom"
ããã¯ãªã³ã¿ãŒãšã©ãŒãã¹ããŒããŸãã 代ããã«ã次ã®ããšãææ¡ããŸãã
ããã§ã®è¶ ãã€ããŒãªåé¡-ãã®ã·ãŒãã®äžéšã¯æ¬¡ã®ããã«ãªããŸãã
let duck; // change this line
let beagle; // change this line
duck.eat(); // Should print "nom nom nom"
beagle.eat(); // Should print "nom nom nom"
@ no-stack-dub-sack-ãããã¯ãã¹ãŠçŽ æŽãããç¹ã§ãããæšæ¥ã¯ãªãã©ã€ã³ã§ãããããã®ã»ã¯ã·ã§ã³ã§åé¡ã¯çºçããŠããŸããã ãã®ã»ã¯ã·ã§ã³ã詳现ã«èªãã§ããã ãããããšãããããŸãðãããç§ã®èãã§ãïŒtl; dr-ããªããæèµ·ãããã¹ãŠã«åæããŸãïŒïŒ
Use Dot Notation to Access the Properties of an Object
ïŒèª°ãã1ã€ã®console.log
ã¹ããŒãã¡ã³ãã䜿çšããå Žåããã¹ãã«åæ Œããå¿
èŠããããŸããVerify an Object's Constructor with instanceof
ïŒæ¬ èœããŠããã»ãã³ãã³ãä¿®æ£ãã House
å®çŸ©æ¹æ³ã«ã€ããŠäžè²«æ§ãä¿ã€å¿
èŠããããŸãã JSã§ç©äºãè¡ãã«ã¯è€æ°ã®æ¹æ³ããããŸããããããåããŠåŠã¶äººã
ãæ··ä¹±ãããå¿
èŠã¯ãããŸãããUnderstanding Own Properties
ïŒ for...in
ã«ã€ããŠã®ããªãã®æèŠã§ã¯ãç§ãã¡ã¯äžè¬çã«ãã«ãªãã¥ã©ã ã§ãã§ã«ã«ããŒãããŠããæŠå¿µã䜿çšããŠãåé¡ãªããšèããŠããŸããã ãã£ã³ãã³ã°ã«ãŒã¯å¥œããªããã«é£ã³åãããšãã§ããŸããããããã¯ãžã®æµãããããŸãã ïŒããããªããšãèŠç¹ã«å°éããåã«ç©äºãåãæ»ãå¿
èŠãããå Žåã課é¡ã¯é·ã/ç¹°ãè¿ãã«ãªãå¯èœæ§ããããŸãïŒã ãšã¯ãããæ§æãç°¡åã«èª¬æããäŸã®ããäžã«ã¡ã¢ãå
¥ãããšåœ¹ç«ã€ãšæããŸãïŒã for...in
ãè¡ãããšãæãåºããŠãã ãã...ïŒUnderstand the Constructor Property
ïŒåœä»€ã®ã³ã³ã¹ãã©ã¯ã¿ãŒã䜿çšããŠè¿œå ãããã€ã³ãã«åæããŸãUse Inheritance So You Don't Repeat Yourself
ïŒããã課é¡ãããããŸãçµã³ä»ããããã®è¯ãç¹Inherit Behaviors from a Supertype
ïŒå¿
ãã»ãã³ãã³ãè¿œå ããå¿
èŠããããã³ã¡ã³ãã圹ç«ã¡ãŸããããã«åãçµã¿ãããã©ããæããŠãã ãã-ç§ã¯å¥ã®ã»ã¯ã·ã§ã³ã«ãžã£ã³ãããŠããŸãïŒ1æ¥ã2æ¥ã§ããã«åãçµãããšãã§ããŸãïŒããŸãã¯å©ããå¿ èŠãªãšãã«ãããéãããšãã§ããŸãð
@HKuzãã£ããããããããšãïŒ ã»ã¯ã·ã§ã³ãçµäºããã³ã¡ã³ããããã°ããã«ããã€ãè¿œå ããŠããã®æç¹ã§æ±ºå®ã§ããŸãããHelpWantedã«å ¬éããã®ãæåã ãšæããŸãã æçš¿ãç¶ããŸãã
次ã®ãã¹ãã±ãŒã¹ãããããããã®èª²é¡ã¯å°ãæ··ä¹±ããŸãã
Dog should have the bark() method as an own property.
ãã®éšåã®è§£æ±ºçã¯ãããæ¢ããŠããŸãïŒ
Dog.prototype.bark = function() {
console.log('Woof!');
};
Dog.prototype.hasOwnProperty('bark')
ã¯true
è¿ããŸããïŒãã¡ããããã¯æ£ããã§ãïŒãæ··ä¹±ã®åå ã¯ããããæ¥ãŠããŸãïŒ Iterate Over All Propertiesããã§ãïŒïŒ
ãã£ã³ãã³ã°ã«ãŒã¯ãã®æç¹ãŸã§æ
å ±ãæäŸãããŠããããããã®ãã¹ãã«åæ Œããã«ã¯ã Dog
ã§ã¯ãªãbark
ã¡ãœãããå®çŸ©ããå¿
èŠããããšæ³å®ããå¯èœæ§ããããŸãããããã¿ã€ãã§ã
éãã¯ã Dog
ã€ã³ã¹ã¿ã³ã¹ã®å Žåã bark
ã¯own
ããããã£ã§ã¯ãªããã Dog.prototype
own
ããããã£ã§ãããšããããšã§ãã Dog.prototype
ã ãããã£ãŠãããã¯ããããã®æŠå¿µã玹ä»ãããã°ããã®äººã«ãšã£ãŠã¯å°ãæ··ä¹±ããŸãã
æãç°¡åãªè§£æ±ºçã¯ããã¹ãã±ãŒã¹ã次ã®ããã«å€æŽããããšã§ãã
Dog.prototype should have the bark() method as an own property.
ãšã¯ãããç°¡åãªèª¬æã¯ããããã¿ã€ãã®prototype
ããããã£ãå®éã«ã¯ãã®ãããã¿ã€ãã®own
ããããã£ã§ããããšããã£ã³ããŒã«ç¥ãããããã§ããïŒ ãããŒãããã¯æ©å£èšèãªã®ã§ããããããã¯å°ãæ··ä¹±ããŠããŸãããããŠç§ã¯ãã®æ··ä¹±ãåãããããã®æè¯ã®æ¹æ³ãäœã§ãããããããŸãã...
å°ããªã¿ã€ããã¹ïŒ
ã... bird
ã®å®çŸ©å€ãã ãšæããŸãã ïŒ
ãã®ãã£ã¬ã³ãžã«ã¯å€§ããªåé¡ã¯ãããŸãã-åãªãææ¡ã§ã-å¿åã®IIFE
ãããäžè¬çãªãã¿ãŒã³ïŒããã³æ¬¡ã®ãã£ã¬ã³ãžã§äœ¿çšããããã¿ãŒã³ïŒã§ããããšã«æ°ä»ããŸããããããããããã§IIFE
ãååãä»ããããšãã§ããŸããå¿åã®IIFE
ãå€ããšãšã©ãŒã远跡ããã®ãé£ãããªãããããããã°ã容æã«ãªããããããã¯ïŒããŸãäžè¬çã§ã¯ãããŸãããïŒããè¯ãæ¹æ³ãšèŠãªãããããšããããŸãã
èãïŒ
ããã«ã€ããŠèããŠã¿ããã®ã§ãã...å€å@dhcodesãŸãã¯@GreenheartïŒ
ç§ã®åé¡ã¯ããã®ã·ããªãªã§IIFE
ãçã«ããªã£ãŠããçç±ã説æããã®ã«ããã£ã¬ã³ãžãé©åã«æ©èœããŠããªããšæãããšã§ãã
ãã®ãœãªã¥ãŒã·ã§ã³ã§ã¯ã次ã®ããšãæ±ããããŸãã
let funModule = (function() {
return {
isCuteMixin: function(obj) {
obj.isCute = function() {
return true;
};
},
singMixin: function(obj) {
obj.sing = function() {
console.log("Singing to an awesome tune");
};
}
};
})();
ãããã£ãŠã次ã®ãããªããšãã§ããŸãã
function Bird () { }
let duck = new Bird();
funModule.singMixin(duck);
duck.sing();
ãã ãã IIFE
ãè¿ããªããžã§ã¯ããå®çŸ©ããã ãã§ãé¢æ°ããŸã£ããåŒã³åºããã«ãããåé·ã§ãªãæ¹æ³ã§åãããšãå®çŸã§ããŸãã
ãã£ã¬ã³ãžã¯ãããèšããŸãïŒ
ã¢ãžã¥ãŒã«ãã¿ãŒã³ã®å©ç¹ã¯ããã¹ãŠã®ã¢ãŒã·ã§ã³åäœã1ã€ã®ãªããžã§ã¯ãã«ããã±ãŒãžåããŠãã³ãŒãã®ä»ã®éšåã§äœ¿çšã§ããããšã§ãã
ããããããã¯IIFEããŸã£ããå¿ èŠãšããªãã®ã§ãããã§æŠå¿µãå°å ¥ãããããããçµã³ä»ããããã®ãã匷åãªæ¹æ³ãèŠã€ãããšããèãã«çåãåããã§ãããããã£ã³ãã³ã°ã«ãŒã¯ãããè¡ãå¿ èŠããããšèããå¯èœæ§ããããããããã¯æ··ä¹±/誀解ãæãå¯èœæ§ããããŸãããã§ãªãå Žåã¯ããã®ãã¿ãŒã³ãéæããŠãã ããã
äœããæèŠã¯ïŒ
@ no-stack-dub-sackãããIIFEã®æè¯ã®äŸã§ã¯ãªãããšã«åæããŸãã äŸãšããŠmodule
ãæäŸãããšããã§ããããïŒ
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ããšãã°ãããã©jsã¢ããªã±ãŒã·ã§ã³çšã®å°ããªãŠãŒãã£ãªãã£ã¢ãžã¥ãŒã«ããããæ®ãã¯å€æŽ/åé€ãããããšããŠãããããããã€ãã®ãããªãã¯ã¡ãœããã®ã¿ãå ¬éããã³ãŒãããŒã¹ã®ä»ã®éšåã§äœ¿çšãããšåé¡ãçºçããå¯èœæ§ããããŸãã
ãã®ãµã€ãã«ã¯å€ãã®è¯ãäŸããããŸãïŒ https ïŒ
@Greenheartããã§ã®2ã€ã®IIFEãã£ã¬ã³ãžã®æåŸã§ã¯ãã¢ãžã¥ãŒã«ãã¿ãŒã³ãšããŠå°å ¥ãããŠããŸãããåé¡ã¯ãããŸãããIIFEã䜿çšããçç±ãšIIFEãããæ確ã«èª¬æã§ãããšæããŸããåãæ©èœãå®çŸããããã«ãå¿ ãããååšããå¿ èŠã¯ãããŸããã ç§ã¯ããããã¹ãŠãèšã£ãŠãããšæããŸãïŒ
IIFEã®ã³ã¢ããªã¥ãŒã¯ããªããžã§ã¯ãã®ãã©ã€ããŒãããããã£ãšã¡ãœãããäœæã§ããããšã§ãã ãããç©äºã®ä¿¡é Œæ§ãé«ããããšãæåŸ ããŠãä»ã®äººãããªãã®ãœãããŠã§ã¢ãïŒèª€ïŒäœ¿çšããæ¹æ³ãæžããã®ã«æ¬åœã«åœ¹ç«ã¡ãŸãã
ããã説æããŠããIIFEããªããŠãåãæ©èœãå®çŸã§ããŸãããIIFEã䜿çšããæ¹ãè¯ãæ¹æ³ã§ããããã®çç±ã¯...ããšãŠãŒã¶ãŒã«ç¥ãããããšãã§ããã°ã
çŸåšã®æ瀺ã¯èšãïŒ
å³æåŒã³åºãé¢æ°åŒïŒIIFEïŒã¯ãé¢é£ããæ©èœãåäžã®ãªããžã§ã¯ããŸãã¯ã¢ãžã¥ãŒã«ã«ã°ã«ãŒãåããããã«ãã䜿çšãããŸãã
ããã«æ¬¡ã®ããã«è¿œå ããŸãããããIIFEããªããŠãåãæ©èœãå®çŸã§ããŸããããã®ã³ã³ããã¹ãã§ã®IIFEã®ã³ã¢ããªã¥ãŒã¯ããªããžã§ã¯ãã®ãã©ã€ããŒãããããã£ãšã¡ãœãããäœæã§ããããšã§ããããã¯ããªããžã§ã¯ãã®ãã©ã€ããŒãããããã£ãšã¡ãœãããæžããã®ã«éåžžã«åœ¹ç«ã¡ãŸããä»ã®äººãããªãã®ãœãããŠã§ã¢ãïŒèª€ïŒäœ¿çšããŠãç©äºãã¯ããã«ä¿¡é Œã§ãããã®ã«ããæ¹æ³ãã
@ no-stack-dub-sackããïŒ ïŒpoint_upïŒ
ç§ã¯ãããã³ã³ãã€ã«ããŠããã€ãã®å°ããªå€æŽãå ããèªç±ãåããŸããã ãã®ãããªãã®ãå¿
èŠã§ãïŒblushïŒ
An <dfn>immediately invoked function expression</dfn> (IIFE) is often used to group related functionality into a single object or module. While the same functionality can be achieved without an IIFE, its core value in this context is that you can create private properties and methods for your objects. This can be very useful for decreasing the ways others can (mis)use your software, and make things much more reliable.
以åã®ãã£ã¬ã³ãžã§ãã®çšèªã䜿çšãããŠããªãå Žåã¯ã <dfn>
䜿çšããå¯èœæ§ããããŸãã
å ã«é²ã¿ããããè¡šèšã䜿çšããŠãªããžã§ã¯ãã®ããããã£ã«ã¢ã¯ã»ã¹ããããã®ãã¹ããæŽæ°
https://github.com/freeCodeCamp/freeCodeCamp/issues/12966#issuecomment-257974706ãç¶è¡ã
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