JavaScript: String.prototype.startsWith

By Xah Lee. Date: . Last updated: .

New in ES2015.

s.startsWith ( searchString )

s.startsWith ( searchString, position )

Returns true if s starts with searchString from position. By default, position is 0. Else, returns false.

const ss = "abcd";

console.log ( ss.startsWith("ab") ); // true
console.log ( ss.startsWith("b") );  // false

console.log ( ss.startsWith("b", 1) ); // true

Reference

ECMAScript 2015 §Text Processing#sec-string.prototype.startswith

String Topic

  1. JavaScript: Default Charset/Encoding
  2. JavaScript: String is 16-Bit Unit Sequence
  3. JavaScript: Unicode Character Escape Sequence
  4. JavaScript: Allowed Characters in Identifier
  5. HTML: Allowed Characters in id Attribute
  6. HTML: Character Sets and Encoding
  7. HTML XML Entities

  1. JavaScript: Template String
  2. JavaScript: Convert String to Number
  3. JavaScript Encode URL, Escape String
  4. JavaScript: Format Number
  5. JavaScript: JSON Object

  1. JavaScript: String Object
  2. JavaScript: String.prototype
  3. JavaScript: String Constructor
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