ES6 - String Method lastIndexOf()


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

Syntax

string.lastIndexOf(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 last found occurrence, otherwise -1 if not found.

Example

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

index = str1.lastIndexOf( "one" ); 
console.log("lastIndexOf found String :" + index );   

Output

lastIndexOf found String :29 
 
lastIndexOf found String :15   

es6_strings.htm

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