Operators & Comparison

Arithmetic, == vs ===, logical operators and truthiness.

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1. 00:00Operators & Comparison. Arithmetic, == vs ===, logical operators and truthiness.
2. 00:05Always use === and !== .
3. 00:10The loose == converts types before comparing, which produces surprises like '5' == 5 being true.
4. 00:16Falsy values: false, 0, -0, '' , null, undefined, NaN.
5. 00:21Everything else is truthy.
6. 00:26Try it yourself — edit the sample and run it in the browser.

Always use === and !== . The loose == converts types before comparing, which produces surprises like '5' == 5 being true.

Falsy values: false, 0, -0, '' , null, undefined, NaN. Everything else is truthy.