Jshint: Add option to suppress "Use '===' to compare with '0'" error

Created on 15 Nov 2013 · 7Comments · Source: jshint/jshint

Using == to compare to zero simply isn't an error or dangerous when comparing a value that is guaranteed to be a Number. For example:

var arr = ["foo"];
var arrIsEmpty = (arr.length == 0);

I tend to use == in these situations and it is a purely stylistic decision. I would like JSHint to respect my well-informed wishes.

Source

timdown

Most helpful comment

For others who may have a hard time to make use of valueof's answer, setting "-W041": false seems to do the trick.

privman on 11 Feb 2015

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You're aware of the eqeqeq option, right? That is where this error comes from, setting it to false will free you from this case. Or are you looking for something more specific, like only suppressing the comparisons to 0 (and not comparisons to other values)?

danielellis on 19 Nov 2013

eqeqeq is the general case. There seems to be a separate check for comparing to 0 that complains even if eqeqeq is false.

What I really want is to be able to suppress all forms of complaints from JSHint about using == and !=, but it's the comparison to 0 that prevents that.

timdown on 19 Nov 2013

Hmm I see. Related code is here, it's definitely specifically calling that comparison out (among others):

https://github.com/jshint/jshint/blob/6140ade7437799e182347bf2d39ec68c3c3d0263/src/jshint.js#L2201-L2215
https://github.com/jshint/jshint/blob/6140ade7437799e182347bf2d39ec68c3c3d0263/src/jshint.js#L1338-L1346

danielellis on 19 Nov 2013

You can disable this warning by its code.