nonDouble

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

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

A synonym of the Float family, offered under the name people reach for first. In JavaScript every number already is a double, so double names no runtime distinction of its own.

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

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

Source

src/lang/number/nonDouble.ts

23 September 2026

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

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