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by fzzzy 856 days ago
Just always use !==. != will automatically cast and !== won't, therefore "1" != 1 is false and "1" !== 1 is true.
1 comments
hellcow 856 days ago
Unless you’re testing if something is null or undefined, in which case a single “x != null” handles it.
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fzzzy 856 days ago
Sure. I usually just use !x for that.
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SamBam 855 days ago
That doesn't test if it's null or undefined, that just tests if it's not falsy.

x = 0; !x → true

y = ""; !y → true

z = null; !z → true

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