nonArray

function nonArray<T>(value: T | unknown): value is Exclude<T | unknown, unknown[] | Array<unknown>>;

nonArray(value) is the same test as !isArray(value), written so that a guard clause reads as a sentence rather than as a negation.

Array.isArray is the whole test, so an array from another frame counts and an array-like object — arguments, a NodeList, { length: 0 } — does not.

isX and nonX answer a question and never interrupt control flow; requireX and requireNonX hand the value back or throw. The scheme is explained in Validation conventions.

Parameters

Parameter	Type	Description
`value`	`T \\| unknown`	The value to check.

Returns

boolean — true when the value is not an array; otherwise false.

In TypeScript the guard narrows value to Exclude<T | unknown, unknown[] | Array<unknown>> inside the branch.

Examples

What passes and what does not

nonArray("abc"); // => true
nonArray({ length: 0 }); // => true
nonArray(null); // => true
nonArray([]); // => false
nonArray([1, 2, 3]); // => false

Source

src/lang/base/nonArray.ts

23 September 2026

This documentation was generated with AI (Claude) from the library's source code.

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