How to use the lastIndexOf function from lodash

Find comprehensive JavaScript lodash.lastIndexOf code examples handpicked from public code repositorys.

lodash.lastIndexOf is a method from the Lodash library that finds the last index of a given element in an array or string.

astrobench.js

5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
* @param {*} value The value to search for.
* @param {number} [fromIndex=array.length-1] The index to search from.
* @returns {number} Returns the index of the matched value or `-1`.
* @example
*
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
* // => 4
*
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
* // => 1

711

+ 3 other calls in file

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

238
239
240
241
242
243
244
245
246
247
module.exports.keyBy               = _.keyBy;
module.exports.keys                = _.keys;
module.exports.keysIn              = _.keysIn;
module.exports.kv                  = _.kv;
module.exports.last                = _.last;
module.exports.lastIndexOf         = _.lastIndexOf;
module.exports.lowerCase           = _.lowerCase;
module.exports.lowerFirst          = _.lowerFirst;
module.exports.lt                  = _.lt;
module.exports.ltContrib           = _.ltContrib;

122

+ 92 other calls in file

How does lodash.lastIndexOf work?

lodash.lastIndexOf is a method that returns the index of the last occurrence of a specified value in an array or string, searching from right to left. It accepts an optional starting index to begin the search.

index.js

GitHub: sluukkonen/iiris

475
476
477
478
479
480
481
482
483
484
params: [num1, num10, num100, num1000],
benchmarks: (array) => {
  const first = 1
  return {
    iiris: () => A.lastIndexOf(first, array),
    lodash: () => _.lastIndexOf(array, first),
    ramda: () => R.lastIndexOf(first, array),
    native: () => array.lastIndexOf(first),
  }
},

lodash.js

GitHub: mdmarufsarker/lodash

81
82
83
84
85
86
87
88
89
90
91
92
93
console.log(join); // => 'a~b~c'


const last = _.last([1, 2, 3]);
console.log(last); // => 3


const lastIndexOf = _.lastIndexOf([1, 2, 1, 2], 2);
console.log(lastIndexOf); // => 3


const nth = _.nth(['a', 'b', 'c', 'd'], 1);
console.log(nth); // => 'b'

+ 15 other calls in file

Ai Example

1
2
3
4
5
6
7
8
const _ = require("lodash");

const array = [2, 1, 3, 1, 2];
const value = 1;
const fromIndex = 3;

const index = _.lastIndexOf(array, value, fromIndex);
console.log(index); // Output: 3

In this example, we have an array of numbers array and we want to find the last index of the value 1 in the array starting from the index 3. We pass the array, the value to search for and the optional fromIndex parameter to _.lastIndexOf and it returns the index 3.

arraydemo.js

GitHub: Hupeng7/es6demo

246
247
248
249
250
251
252
253
254
255
256
let last1 = _.last([1, 2, 3]);
console.log('last1--->', last1);
//last1---> 3


//_.lastIndexOf(array,value,[fromIndex=array.length-1])
let lastIndexOf1 = _.lastIndexOf([1, 2, 1, 2], 2);
console.log('lastIndexOf1--->', lastIndexOf1);
//lastIndexOf1---> 3
let lastIndexOf2 = _.lastIndexOf([1, 2, 1, 2], 2, 2);
console.log('lastIndexOf2--->', lastIndexOf2);

led-view.js

GitHub: philmay/metra-led-map

593
594
595
596
597
598
599
600
601
602
ledLightArray.forEach((ledObject) => {
	newPosition = Math.floor(ledObject.ledIndex/2);
	processedPositions.push(newPosition);
	// If there are two instances of this position, then two trains are passing
	// each other and the LED should be yellow
	if (_.indexOf(processedPositions, newPosition) != _.lastIndexOf(processedPositions, newPosition)) {
		newColor = "yellow";
		// If they are passing in a station, paint it white
		if (newPosition == upnwOgilve ||
		    newPosition == palatine ||

Other functions in lodash

Sorted by popularity

lodash.get is the most popular function in lodash (7670 examples)

Other popular packages:

Home

About