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How to use the findLastIndex function from lodash

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

lodash.findLastIndex is a function in the Lodash library that searches an array in reverse order and returns the index of the last element that satisfies a provided condition.

astrobench.js

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*   return chr.age > 30;
* });
* // => 1
*
* // using "_.where" callback shorthand
* _.findLastIndex(characters, { 'age': 36 });
* // => 0
*
* // using "_.pluck" callback shorthand
* _.findLastIndex(characters, 'blocked');

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+ 5 other calls in file

lodash-contrib.commonjs.js

GitHub: node4good/lodash-contrib

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module.exports.filter              = _.filter;
module.exports.find                = _.find;
module.exports.findIndex           = _.findIndex;
module.exports.findKey             = _.findKey;
module.exports.findLast            = _.findLast;
module.exports.findLastIndex       = _.findLastIndex;
module.exports.findLastKey         = _.findLastKey;
module.exports.first               = _.first;
module.exports.firstExisting       = _.firstExisting;
module.exports.fix                 = _.fix;

122

+ 92 other calls in file

How does lodash.findLastIndex work?

lodash.findLastIndex is a function in the Lodash library that iterates over an array in reverse order and returns the index of the last element that matches the provided callback function.

lodash.js

GitHub: mdmarufsarker/lodash

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console.log(fillWith); // => [2, 2, 2]


const findIndex = _.findIndex([1, 2, 3, 4], n => n % 2 === 1);
console.log(findIndex); // => 0


const findLastIndex = _.findLastIndex([1, 2, 3, 4], n => n % 2 === 1);
console.log(findLastIndex); // => 2


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

+ 15 other calls in file

Config.js

GitHub: isomerpages/isomercms-backend

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let newIndex = index
if (index === undefined) {
  if (item.split("/").length === 2) {
    // if file in subfolder, get index of last file in subfolder
    newIndex =
      _.findLastIndex(
        content.collections[collectionName].order,
        (f) => f.split("/")[0] === item.split("/")[0]
      ) + 1
  } else {

+ 6 other calls in file

Ai Example

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const _ = require("lodash");

const arr = [5, 10, 15, 20, 25, 30];
const index = _.findLastIndex(arr, (num) => num > 20);

console.log(index); // Output: 5

In this example, we're using lodash.findLastIndex to search for the last element in the arr array that is greater than 20. The function returns the index of that element in the array, which is 5 in this case.

ghost_head.js

GitHub: neqt/Ghost-Custom-Theme

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// AMP template has style injected directly because there can only be one <style amp-custom> tag
if (options.data.site.accent_color && !_.includes(context, 'amp')) {
    const accentColor = escapeExpression(options.data.site.accent_color);
    const styleTag = `<style>:root {--ghost-accent-color: ${accentColor};}</style>`;
    const existingScriptIndex = _.findLastIndex(head, str => str.match(/<\/(style|script)>/));

    if (existingScriptIndex !== -1) {
        head[existingScriptIndex] = head[existingScriptIndex] + styleTag;
    } else {

+ 3 other calls in file

arrays.js

GitHub: ashishdock/lodash-practice

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// console.log(_.findLastIndex(objects3, ['year', 2019]));
// console.log(_.findIndex(objects3, ['year', 2016]));
// console.log(_.findLastIndex(objects3, ['year', 2016]));


// console.log(
//   _.findLastIndex(objects3, function (t) {
//     return t.year === 2019;
//   })
// );

+ 2 other calls in file

arraydemo.js

GitHub: Hupeng7/es6demo

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let users4 = [
    { 'user': 'barney', 'active': true },
    { 'user': 'fred', 'active': false },
    { 'user': 'pebbles', 'active': false }
];
let findLastIndex1 = _.findLastIndex(users4, function (o) { return o.user == 'pebbles' });
console.log('findLastIndex1--->', findLastIndex1);
//findLastIndex1---> 2
let findLastIndex2 = _.findLastIndex(users4, { 'user': 'barney', 'active': true });
console.log('findLastIndex2--->', findLastIndex2);

+ 3 other calls in file

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