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JavaScript

Type Coercion

Definition

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()`.

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Related Terms

Truthy and Falsy

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.

Strict Equality

The === operator that checks both value and type without type coercion. Unlike == (loose equality), strict equality does not convert operands before comparing. Always prefer === over ==.