Underscore.js _.mapArgsWith() Method
Last Updated :
19 Aug, 2020
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
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:
9
Example 2:
Javascript
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:
225
Example 3:
Javascript
var _ = require( 'underscore-contrib' );
function cs (x) {
return
"GeeksforGeeks : Computer Science Portal for Geeks" ;
}
function geek (x) {
return "GeeksforGeeks" ;
}
var gfg = _.mapArgsWith(geek);
var gfgFunc = gfg(cs);
console.log(gfgFunc())
|
Output:
GeeksforGeeks : Computer Science Portal for Geeks
Example 4:
Javascript
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([ "GeeksforGeeks" ,
"Computer Science Portal for Geeks" ]))
|
Output:
GeeksforGeeks : Computer Science Portal for Geeks
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