Underscore.js _.juxt() Method

The _.juxt() method returns a function whose return value is an array of the results after calling each of the functions with the given arguments.

Syntax:

_.juxt( function1, function2, .., function );

Parameters: This method takes n functions containing the logic to return values.

Return Value: This method returns a function.

Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed.

underscore.js contrib library can be installed using npm install underscore-contrib –save.

Example 1: In this example, we will see the use of the _.juxt() method

javascript

// Defining underscore contrib variable
const _ = require('underscore-contrib');

function firstG(val) {
    return val[0];
}
function F(val) {
    return val[5];
}
function lastG(val) {
    return val[8];
}

// Defining function
let firstAndLastChars = _.juxt(firstG, F, lastG);

console.log(firstAndLastChars("GeeksforGeeks"));

Output:

[ 'G', 'f', 'G' ]

Example 2: In this example, we will see the use of the _.juxt() method

javascript

// Defining underscore contrib variable
const _ = require('underscore-contrib');

function a() {
    return "a";
}
function b() {
    return "b";
}
function c() {
    return "c";
}
function d() {
    return "d";
}


// Defining function
let firstAndLastChars = _.juxt(a, b, c, d);

console.log(firstAndLastChars("GeeksforGeeks"));

Output:

[ 'a', 'b', 'c', 'd' ]