JavaScript

Strict Equality

Definition

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 `==`.

Code Example

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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.

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().