Lodash _.mapArgs() Method

The Lodash _.mapArgs() method takes a target function and returns a new function that accepts a mapping function, which in turn returns a function that will map its arguments before calling the original target function.

Syntax:

_.mapArgs( target_function, mapping_function );

Parameters: This method accepts two parameters as mentioned above and defined below:

• target_function: This parameter is original function called.
• mapping_function: It is a mapping function to be accepted by the function.

Return Value: This method returns a function.

Note: To execute the below examples, you have to install the lodash-contrib library by using this command prompt and execute the following command.

npm install lodash-contrib

Below examples illustrate the Lodash _.mapArgs() method in JavaScript:

Example 1: we made a function that cubes the given value then adds that value to itself.

Javascript

// Defining lodash contrib variable
var _ = require('lodash-contrib');

function add (x)
{
    return x + x; }

function cube (x)
{
    return  x * x * x;
}

var cubethenadd = _.mapArgs(add)(cube);

console.log(cubethenadd(5))

Output:

250

Example 2: 

Javascript

// Defining lodash contrib variable
var _ = require('lodash-contrib');

function add (x)
{
    return x + x; }

function sub (x)
{
    return  x - x;
}

var subthenadd = _.mapArgs(add)(sub);

console.log(subthenadd(7))

Output:

0