Lodash _.lastIndexOf() method is like the _.indexOf method except that it iterates over elements of an array from right to left.
Syntax:
_.lastIndexOf(array, value, [fromIndex=array.length-1]);Note: If the value is not found in the array -1 is returned.
Parameters:
- array: It is the array in which value is to be found.
- value: It is the value to be looked at in the array.
- fromIndex: It is the index after which we have to look for the value.
Return Value:
- It returns the index of the value in the array. If the value is not found, the array returns -1.
Example 1: In this example, we are finding the index of the 2 in a given array by the use of the _lastIndexOf() method.
// Requiring the lodash library
const _ = require("lodash");
// Original array
let array = [1, 2, 2, 3, 4]
// Printing original array
console.log("Array : ", array)
// Looking for value 3 from Last index
let index = _.lastIndexOf(array, 2)
// Printing the Index of the value
console.log("Index : ", index)
Output:
Example 2: In this example, we are finding the index of the 2 from 2 index number in a given array by the use of the _lastIndexOf() method.
// Requiring the lodash library
const _ = require("lodash");
// Original array
let array = [1, 2, 2, 3, 4, 2]
// Printing original array
console.log("Array : ", array)
// Looking for value 3 from Last index
let index = _.lastIndexOf(array, 2, 2)
// Printing the Index of the value
console.log("Index : ", index)
Output:
Example 3: In this example, we are finding the index of the 4 in a given array by the use of the _lastIndexOf() method and it is returning -1 as it is not present in that array.
// Requiring the lodash library
const _ = require("lodash");
// Original array
let array = [1, 2, 2, 3, 4, 2]
// Printing original array
console.log("Array : ", array)
// Looking for value 3 from Last index
let index = _.lastIndexOf(array, 4, 2)
// Printing the Index of the value
console.log("Index : ", index)
Output:
