isNumber
INFO
This function is only available in es-toolkit/compat for compatibility reasons. It either has alternative native JavaScript APIs or isn’t fully optimized yet.
When imported from es-toolkit/compat, it behaves exactly like lodash and provides the same functionalities, as detailed here.
Checks if a given value is a number.
This function can also serve as a type predicate in TypeScript, narrowing the type of the argument to number.
Signature
typescript
function isNumber(value?: unknown): value is number;Parameters
value(unknown): The value to check if it is a number.
Returns
(value is number): Returns true if value is a number, else false.
Examples
typescript
const value1 = 123;
const value2 = 'abc';
const value3 = true;
console.log(isNumber(value1)); // true
console.log(isNumber(value2)); // false
console.log(isNumber(value3)); // false