ES6 - indexOf()


Advertisements

This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex or -1 if the value is not found.

Syntax

string.indexOf(searchValue[, fromIndex])

Argument Details

  • searchValue − A string representing the value to search for.
  • fromIndex − The location within the calling string to start the search from. It can be any integer between 0 and the length of the string. The default value is 0.

Return Value

Returns the index of the found occurrence, otherwise -1 if not found.

Example

var str1 = new String( "This is string one" );
var index = str1.indexOf( "string" );
console.log("indexOf found String :" + index );
var index = str1.indexOf( "one" );
console.log("indexOf found String :" + index );

Output

indexOf found String :8
indexOf found String :15
Advertisements