isString#

Check if the given value is a string.

Usage Scenarios#

• Input Validation: Validate string input before processing.
• Type Checking: Ensure value is a string before string operations.
• Type Narrowing: Narrow variable types in TypeScript.

Examples#

import { isString } from 'funtool';

isString('hello'); // ✅ true
isString(123); // ❌ false
isString(null); // ❌ false
isString(undefined); // ❌ false

Signature#

function isString(v: any): v is string

Parameters#

• v (any): The value to test if it is a string.

Returns#

• (v is string): Returns true if the value is a string, otherwise returns false.