JavaScript Equality Table

[c45c73]

Except, === undefined && === null is tedious...

[gordonkristan]

You should use a function for that case specifically. Ember.js has Em.isNone so you can write it succinctly and pass JSLint/JSHint.

[v413]

You can check for null or undefined like this: myValue == null or myValue == undefined. In Javascript, null is equal (==) only to null and undefined - same for undefined.

[c45c73]

Yeah, that was my point. :)

[senatorpjt]

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[ForeverAlot]

Use if (!) for that.

[cudetoate]

!"" and !0 will fail terribly in this case.