JavaScript String startsWith() Method

startsWith()The method determines whether the string starts with the specified character of the string.

If the string starts with the character, the startsWith() method returnstrueotherwise returnfalse.

Note:This method is case-sensitive.

Syntax:

string.startsWith(searchValue, position)

Example

var str = 'www.oldtoolbag.com';
str.startsWith('W.n')　　　//　true

The numbers in the table specify the first browser version that fully supports the startsWith() method:

Method
startsWith()	41	17	28	9	12

Parameters	Description
searchValue	(Required) The character to search for at the beginning of this string
position	(Optional) The starting position to search in this stringthe position of searchValue;default is 0

Return value:	If the given character is found at the beginning of the stringtrue;otherwisefalse.
JavaScript version:	ECMAScript 6

Check if the string starts with 'Pollution' from position4Start searching:

Example

var str = 'Air Pollution is the introduction of chemicals to the atmosphere.';
str.startsWith('Pollution',　4);