Underscore.js _.mapArgsWith() Method

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The _.mapArgsWith() method takes a mapping function and returns a new combinator function which will take a target function and will return a new function that maps its arguments with the mapping function before executing the body of the target function.

Syntax:

_.mapArgsWith( mapping_function );

Parameters:

mapping_function: Mapping function to be accepted by the function.

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: We made a function that cubes the given value then adds that value to itself.

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
function add (x) {  
    return x + x + x ;  
} 
  
function sub (x) { 
    return  x - 2;  
} 
  
var addnow = _.mapArgsWith(sub); 
  
var subnow = addnow(add); 
  
console.log(subnow(5)) 

Output:

Example 2:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
function squ (x) {  
    return x * x ;  
} 
  
function add (x) { 
    return  x + 10;  
} 
  
var addnow = _.mapArgsWith(add); 
  
var sq = addnow(squ); 
  
console.log(sq(5))

Output:

Example 3:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
function cs (x) {  
    return 
"zambiatek : Computer Science Portal for Geeks";  
} 
  
function geek (x) { 
    return  "zambiatek";  
} 
  
var gfg = _.mapArgsWith(geek); 
  
var gfgFunc = gfg(cs); 
  
console.log(gfgFunc())

Output:

zambiatek : Computer Science Portal for Geeks

Example 4:

Javascript

// Defining underscore contrib variable 
var _ = require('underscore-contrib');  
  
function cs (x) {  
    return x;  
} 
  
function geek (x) { 
    return  x[0]+" : "+x[1];  
} 
  
var gfg = _.mapArgsWith(geek); 
  
var gfgFunc = gfg(cs); 
  
console.log(gfgFunc(["zambiatek", 
    "Computer Science Portal for Geeks"])) 

Output:

zambiatek : Computer Science Portal for Geeks

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