nonInteger
function nonInteger<T>(value: T | number): value is T;
nonInteger(value) is the same test as !isInteger(value), written so that a guard clause reads as a sentence rather than as a negation.
A number with no fractional part. Nothing is coerced, so the string "42" is not an integer, and NaN is not either.
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 |
|---|---|---|
|
| The value to check. |
Returns
boolean — true when the value is not an integer; otherwise false.
In TypeScript the guard narrows value to T inside the branch.
Examples
What passes and what does not
nonInteger(1.5); // => true
nonInteger(NaN); // => true
nonInteger("42"); // => true
nonInteger(42); // => false
nonInteger(-7); // => false
nonInteger(0); // => false
See also
Source
23 September 2026
This documentation was generated with AI (Claude) from the library's source code.