JavaScript if, else if, and else: the practical difference
Understand exactly how JavaScript chooses a branch, why order matters, and when separate if statements behave differently from an else-if chain.
JavaScript
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The library
Programming guides that get to the point.
Understand the rule, see it run, learn the edge case, and make the decision.
JavaScript switch vs if / else: choose by the shape of the decision
A practical comparison of switch and if / else in JavaScript, including strict matching, fall-through, ranges, declarations, and lookup objects.
JavaScript
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JavaScript truthy and falsy values without the guesswork
A complete, usable model of JavaScript boolean coercion—including the empty array trap, nullish values, NaN, and when to compare explicitly.
JavaScript
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