nonFloat

function nonFloat<T>(value: T | number): value is T;

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

JavaScript has one numeric type, so 1.0 and 1 are the same value: the question answered is whether a fraction survives at runtime, not how the literal was written. The infinities have no fraction and are excluded.

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 \\| number`	The value to check.

Returns

boolean — true when the value is not a number with a fractional part; otherwise false.

In TypeScript the guard narrows value to T inside the branch.

Examples

What passes and what does not

nonFloat(42); // => true
nonFloat(1.0); // => true
nonFloat(Infinity); // => true
nonFloat("1.5"); // => true
nonFloat(1.5); // => false
nonFloat(-0.1); // => false

Source

src/lang/number/nonFloat.ts

23 September 2026

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

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