How to search a Javascript array from the end
Description
lastIndexOf syntax:
lastIndexOf(itemToLookFor, optionalIndexToStartWith)
lastIndexOf() starts from the
back of the array to do the search.
lastIndexOf() returns the position of the item
in the array or -1 if the item isn't in the array.
An identity comparison is used during comparing.
Example
var numbers = [1,2,3,4,5,4,3,2,1];
console.log(numbers.lastIndexOf(4)); //5
console.log(numbers.lastIndexOf(4, 4)); //3
// www .j a va 2s .c om
var person = { name: "JavaScript" };
var people = [{ name: "JavaScript" }];
var morePeople = [person];
console.log(morePeople.indexOf(person)); //0
The code above generates the following result.
