Wednesday, 27 March, 2019 UTC
Summary
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 -
requiredstartIndex
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.
Common Uses and SnippetsThis method is case sensitive
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