JavaScript Glossary: String lastIndexOf()
Publikováno: 27.3.2019
Basics
The lastIndexOf() method returns the last position within a String object which an element can be found. The search starts from the last position of the String object. ...
Basics
The lastIndexOf() method returns the last position within a String object which an element can be found. The search starts from the last position of the String object. The method will return -1 if the specified parameter cannot be found.
"hello world scotch world".lastIndexOf("world")
// 19https://scotch.io/embed/gist/0d1de6464f68984f5d06f6a0a5b1f833
Syntax
const indexOfLastOccurence = string.lastIndexOf(searchParam, startIndex)2 Parameters
searchParam
This is the string value to search for within the String object - required
startIndex
This is the index at which the search will begin. Search typically begins from the string.length - 1 index, which is the last position of the object. If the length of the provided string is 0, or if no item was found, it returns -1.
Returns a number
The method returns a number whch is the index of the last occurence of the search parameter.
This method is case sensitive
Common Uses and Snippets
Find the last word repitition in a list
With the lastIndexOf() method, the index of the last occurrence of a particular string can be obtained.
https://scotch.io/embed/gist/710066198c067d17045b34b57bc486ea