es-toolkit/docs/reference/compat/string/startsWith.md

startsWith

::: 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 string contains another string at the beginning of the string.

Checks if one string startsWith another string. Optional position parameter to start searching from a certain index.

Signature

function startsWith(str: string, target: string, position: number = 0): string;

Parameters

• str (string): The string that will be searched.
• target (string): The string that it should contain at the start.
• position (number, optional): Optional: offset to start searching in the str string.

Returns

(boolean) Whether or not the str string starts with the target string

Examples

import { startsWith } from 'es-toolkit/string';

startsWith('fooBar', 'foo'); // returns true
startsWith('fooBar', 'Bar'); // returns false
startsWith('fooBar', 'abcdef'); // returns false
startsWith('fooBar', 'Bar', 3); // returns true