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JavaScript

Nullish Coalescing

Definition

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.

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.

Optional Chaining

The ?. operator that safely accesses deeply nested object properties without throwing if an intermediate value is null or undefined. Returns undefined instead of throwing a TypeError.