javascript array find last index code example

Example 1: Javascript get last item in array

var colors = ["red","blue","green"];
var green = colors[colors.length - 1]; //get last item in the array

Example 2: js last index of

const str = "Users/Edit/12345";
let idx = str.lastIndexOf("/"); // returns 10
idx = str.lastIndexOf("x"); // returns -1

idx = str.lastIndexOf("Edit") // returns 6
idx = str.lastIndexOf("edit") // returns -1 -- case sensitive

// add "from" parameter
// the search happens backwards, starting at the provided from parameter
idx = str.lastIndexOf("s"); // returns 4
idx = str.lastIndexOf("s", 3); // returns 1

Example 3: javascript code for find the last element in array

if (loc_array[loc_array.length - 1] === 'index.html') {
   // do something
} else {
   // something else
}

Example 4: lastindexof

var numbers = [2, 5, 9, 2];
numbers.lastIndexOf(2);     // 3
numbers.lastIndexOf(7);     // -1
numbers.lastIndexOf(2, 3);  // 3
numbers.lastIndexOf(2, 2);  // 0
numbers.lastIndexOf(2, -2); // 0
numbers.lastIndexOf(2, -1); // 3

Example 5: last index of array js

array.lastIndexOf(searchElement[, fromIndex]);