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Lodash _.mapArgs() Method

  • Last Updated : 18 Sep, 2020

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



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