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JavaScript

Truthy and Falsy

Definition

In JavaScript, every value is either truthy or falsy when evaluated in a boolean context. Falsy values are: `false`, `0`, `''`, `null`, `undefined`, `NaN`, and `0n`. Everything else is truthy, including empty arrays and objects.

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Related Terms

Type Coercion

JavaScript's automatic conversion of values from one type to another during operations. Implicit coercion happens with operators like ==, +, and in boolean contexts. Explicit coercion uses functions like Number(), String(), Boolean().

Nullish Coalescing

The ?? operator that returns the right-hand operand when the left-hand operand is null or undefined. Unlike ||, it does not treat 0, '', or false as nullish, making it safer for default values.