Lodash _.bindKey() Method

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Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers, etc.

The _.bindKey() method of Function in lodash is used to create a function which calls the method at the object[key] along with the partials added to the arguments it accepts.

Note:

This method is different from the _.bind() method as it permits bound functions to mention methods that may be reinterpreted or does not still exist.
The _.bindKey.placeholder value that is by default ( _ ) in monolithic builds which is utilized as a placeholder for partially used arguments.

Syntax:

_.bindKey( object, key, partials )

Parameters: This method accepts three parameters as mentioned above and described below:

object: It is the object which is used to call the method on.
key: It is the key to be used in the method.
partials: It is the arguments which is to be partially applied. It is an optional parameter.

Return Value: This method returns the new bound function.

Example 1:

Javascript

// Requiring lodash library 
const _ = require('lodash'); 
  
// Defining object parameter of this method 
var obj = { 
  'author': 'Nidhi', 
  'welcome': function(greet, mark) { 
    return greet + ' ' + this.author + mark; 
  } 
}; 
  
// Using the _.bindKey() method  
// with its parameters 
var bound_fun = 
  _.bindKey(obj, 'welcome', 'Hello'); 
  
// Calling bound_fun by passing its value 
bound_fun('!!');

Output:

Hello Nidhi!!

Example 2: Using a bound with the placeholder.

Javascript

// Requiring lodash library 
const _ = require('lodash'); 
  
// Defining object parameter of this method 
var obj = { 
  'portal': function(portal, mark) { 
    return 'Welcome to ' + portal + mark; 
  } 
}; 
  
// Using the _.bindKey() method with its 
// parameters and a placeholder 
var bound_fun = 
  _.bindKey(obj, 'portal', _, '!'); 
  
// Calling bound_fun by passing its value 
bound_fun('zambiatek');

Output:

Welcome to zambiatek!

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