Question

How to find the last index of an item in array in JavaScript

Answer 1

var array = [1, 2, 3, 5, 6, 7, 9, 1];
document.write(array.lastIndexOf(1) + "<br />"); 
document.write(array.lastIndexOf(8) + "<br />"); 
document.write(array.lastIndexOf(1, 3) + "<br />"); // 3 from index number
document.write(array.lastIndexOf(1, 9) + "<br />"); // 9 from index number
document.write(array.lastIndexOf(1, -2) + "<br />"); // -2 from index number
document.write(array.lastIndexOf(1, -1) + "<br />"); // -2 from index number

/*
run:

7
-1
0
7
0
7

*/

 

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