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Lodash _.bindKey



Lodash is a popular JavaScript utility library that provides many helper functions for handling common tasks such as array manipulation, object manipulation, string manipulation, and more. One of its key features is its ability to simplify function binding through the _.bindKey method.


The _.bindKey method is a powerful utility function for binding a function to an object in JavaScript. This method allows you to create a new function that is bound to a specific object, meaning that the this keyword inside the function will always refer to that object. This is particularly useful when dealing with event handlers, callbacks, or any other function that needs to retain a specific this context.


The syntax for the _.bindKey method is as follows:

_.bindKey(object, key, [partials])

  • object: The object to bind the function to.
  • key: The name of the method to bind.
  • [partials]: An optional array of arguments to partially apply to the function.


Here is an example of how to use the _.bindKey method:

const user = {
  name: 'John',
  greet(greeting) {
    console.log(greeting + ', ' +;

const hello = _.bindKey(user, 'greet', 'Hello');

hello(); // Output: Hello, John

In this example, we are creating a new function called hello, which is bound to the greet method of the user object. We are also passing in a partial argument of "Hello". When we call the hello function, the output will be "Hello, John", as expected.


The _.bindKey method is particularly useful when dealing with event handlers or callbacks that need to maintain a specific context. By binding a function to a specific object, you can avoid common bugs and issues related to the this keyword. Additionally, it can simplify your code and make it more readable, as it allows you to invoke functions with a clear context.


The _.bindKey method is a powerful utility function for binding a function to an object in JavaScript. It can simplify your code and help eliminate common bugs related to this context. By using this method, you can create more readable and maintainable code.