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String.prototype.startsWith()

The startsWith() method determines whether a string begins with the characters of a specified string, returning true or false as appropriate.

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Syntax

startsWith(searchString)
startsWith(searchString, position)

Parameters

searchString: The characters to be searched for at the start of this string. Cannot be a regex.
position Optional: The start position at which searchString is expected to be found (the index of searchString's first character). Defaults to 0.

Return value

true if the given characters are found at the beginning of the string; otherwise, false.

Exceptions

TypeError: If searchString is a regex.

Description

This method lets you determine whether or not a string begins with another string. This method is case-sensitive.

Examples

Using startsWith()

const str = 'To be, or not to be, that is the question.';

console.log(str.startsWith('To be')); // true
console.log(str.startsWith('not to be')); // false
console.log(str.startsWith('not to be', 10)); // true

Specifications

Specification
ECMAScript Language Specification # sec-string.prototype.startswith

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	Deno	Node.js
`startsWith`	41	12	17	No	28	9	37	36	17	24	9	3.0	1.0	4.0.0 0.12.0