Applies to: String Object
The lastIndexOf method returns the last occurrence of a substring within a String object.
Syntax
strVariable.lastIndexOf(substring, startindex)
"String Literal".lastIndexOf(substring, startindex)
The lastIndexOf method syntax has these arguments:
| Part |
Description |
substring |
The substring to search for within the String object. |
startindex |
An optional integer value specifying the index to begin searching within the String object. If omitted, searching begins at the end of the string. |
Return value
The lastIndexOf method returns the last occurrence of a substring within a String object.
Example
The lastIndexOf method returns an integer value indicating the beginning of the substring within the String object. If the substring is not found, a -1 is returned.
If startindex is negative, startindex is treated as zero. If it is larger than the greatest character position index, it is treated as the largest possible index.
Searching is performed right to left. Otherwise, this method is identical to indexOf.
The following example illustrates the use of the lastIndexOf method:
function lastOccurrence(str1,str2)
{
var s = str1.lastIndexOf(str2);
return(s);
}
document.write(lastOccurrence("the fox jumped over the flag ","flag"));
|
 To run the code, paste it into JavaScript Editor, and click the Execute button.
See also: indexOf method, String Object methods, String Object Properties |
