Variable: isString

const isString: TypePredicate<unknown, string>

Defined in: predicate/guards/index.ts:36

Type guard that checks if a value is a string.

Narrows the type to string in TypeScript.

Param

The value to check

Returns

True if value is a string

Example

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

const mixed: unknown[] = ['hello', 42, 'world', true]
const strings = R.filter(mixed, isString) // type: string[]
// => ['hello', 'world']

// Type narrowing in conditionals
const value: unknown = 'test'
if (isString(value)) {
  console.log(value.toUpperCase()) // TypeScript knows value is string
}

See

• isNumber - for number type guard
• isBoolean - for boolean type guard