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The startsWith() Method for JavaScript Strings [Examples]

The startsWith() String method in JavaScript will determine whether a string starts with a certain string or character. Here’s how it is used, with code examples.

startsWith() Method JavaScript Syntax

The startsWith() method can be called from any String variable.

string.startsWith(SEARCH, START)

Note that:

  • string can be any string value or variable
  • SEARCH should be the string which you want to check if string starts with
    • If specified, START will be used as the starting position when checking STRING
    • The portion of the string before START will be ignored
      • This can be useful if you want to check whether a string exists at a certain position within a string
  • A boolean value of TRUE (if the string starts with the given value) or FALSE is returned

startsWith() Examples

The below examples show how the startsWith Method is used. A string variable called test is defined, and the startsWith() method is called on it.

let test = 'Use the Force, Luke.'

test.startsWith('Use the);         // true
test.startsWith('the Force');      // false
test.startsWith('the Force', 4);   // true

Note the last example supplies a start position, so that only a portion of the string is checked.

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