isNumberLike
function isNumberLike(value: unknown): boolean;
A finite number, or a string that converts to one. NaN, the infinities and the empty string are excluded, which is what separates this from a bare Number(value).
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 convertible to a number; otherwise false.
Examples
What passes and what does not
isNumberLike(1); // => true
isNumberLike("1.5"); // => true
isNumberLike(" 42 "); // => true
isNumberLike(NaN); // => false
isNumberLike(Infinity); // => false
isNumberLike(""); // => false
isNumberLike(null); // => false
See also
Source
23 September 2026
This documentation was generated with AI (Claude) from the library's source code.