JS: String.prototype.startsWith

By Xah Lee. Date: . Last updated: .

New in ES2015.

s.startsWith ( searchString )

s.startsWith ( searchString, position )

Return 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. JS: String Overview
  2. JS: Template String
  3. JS: String Escape Sequence
  4. JS: Unicode Escape Sequence
  5. JS: String Object
  6. JS: String.prototype
  7. JS: String to Number
  8. JS: Encode URL, Escape String
  9. JS: Format Number
  10. JS: JSON
  11. JS: Source Code Encoding
  12. JS: Allowed Characters in Identifier
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