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Lodash _.reduceRight() Method - GeeksforGeeks

Last Updated : 03 Sep, 2024

Lodash _.reduceRight() method is similar to the _.reduce() method except that it iterates over elements of collection from right to left.

_.reduceRight(collection, iteratee, accumulator)

This method accepts three parameters as mentioned above and described below:

• collection: This parameter holds the collection to iterate over.
• iteratee: This parameter holds the function invoked per iteration.
• accumulator: This parameter holds the initial value.

This method returns the accumulated value.

Example 1: This code uses the Lodash library to flatten a nested array by iterating from right to left and concatenating subarrays using the _.reduceRight() method.

Here, const _ = require(‘lodash’) is used to import the lodash library in the file.

// Requiring the lodash library 
const _ = require("lodash"); 
     
// Original array 
let array = [[10, 11], [12, 13], [14, 15]];
 
// Use of _.reduceRight() method
 
let gfg = _.reduceRight(array, 
    function(flattened, other) {
  return flattened.concat(other);
}, []);

// Printing the output 
console.log(gfg);

Output:

[ 14, 15, 12, 13, 10, 11 ]

Example 2: In this example, the code requires the Lodash library and uses the _.reduceRight method to flatten a nested array and then displays the flattened result in the console.

// Requiring the lodash library 
const _ = require("lodash"); 
     
// Original array 
let array = [['C++', 'C#'], 
    ['DAA', 'Java'], ['Lodash', 'Python']];
 
// Use of _.reduceRight() method
 
let gfg = _.reduceRight(array, 
    function(flattened, other) {
  return flattened.concat(other);
}, []);

// Printing the output 
console.log(gfg);

Output:

[ 'Lodash', 'Python', 'DAA', 'Java', 'C++', 'C#' ]

Note:

This code will not work in normal JavaScript because it requires the library lodash to be installed.

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