Variable: isNumber

const isNumber: TypePredicate<unknown, number>

Defined in: predicate/guards/index.ts:68

Type guard that checks if a value is a number.

Narrows the type to number in TypeScript. Returns false for NaN (use isFiniteNumber to include NaN).

Param

The value to check

Returns

True if value is a number and not NaN

Example

import * as R from 'remeda'
import { isNumber } from 'receta/predicate'

const mixed: unknown[] = [42, 'hello', 100, null]
const numbers = R.filter(mixed, isNumber) // type: number[]
// => [42, 100]

// Type narrowing
const value: unknown = 42
if (isNumber(value)) {
  console.log(value * 2) // TypeScript knows value is number
}

See

• isFiniteNumber - to allow NaN
• isInteger - for integer type guard
• isString - for string type guard