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Lodash _.bindAll() Method

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Lodash _.bindAll() method is used to bind the number of methods on the object. Each method is given a method name. It is handy to work with the event handlers.

Syntax:

_.bindAll(object, methodNames)

Parameter:

This method accepts two parameters as mentioned above and described below:

  • object: It is the object that contains different methods and functions to bind.
  • methodNames: It is the names of methods present in the object.

Return value:

It returns an object.

Note: This method doesn’t set the “length” property of bound functions.

Example 1: In this example, the code uses the Lodash library’s _.bindAll method to ensure the correct context for functions when handling click and hover events on a button element in an HTML document.

Javascript

<!DOCTYPE html>
<html>
 
<head>
    <script src=
    </script>
</head>
 
<body>
    <button id="button">button</button>
 
    <script type="text/javascript">
 
        let object={
                label  : 'GeeksforGeeks',
                click: function(){
                    console.log( 'clicked: ' + this.label);
                    },
                hover: function(){
                    console.log( 'hovering: ' + this.label);
                    }
                };
 
        // Using bindAll() method of lodash
        _.bindAll(object, 'click', 'hover');
 
        // When the button is clicked, 
        // this.label will have the correct value.
        let btn=document.querySelector("#button");
         
        btn.addEventListener('click', object.click);
        btn.addEventListener('click', object.hover); 
    </script>
</body>
 
</html>

                    

Output:

Example 2: In this example, the code uses the Lodash library’s _.bindAll method to bind functions to an object, and when a button is clicked in an HTML document

Javascript

<!DOCTYPE html>
<html>
 
<head>
    <script src=
    </script>
</head>
 
<body>
    <button id="button">button</button>
    <script type="text/javascript"
        let object={
            printNum:()=>{
                for(let i=0; i<5; i++)
                    console.log(i+" geeksforgeeks")
                },
            func: function(){ console.log(
                'Function : ' + this.printNum);
                },
            output: function(){ "Output : "+this.printNum();
                }
            };
         
        // Using bindAll() method of lodash
        _.bindAll(object, 'func', 'output');
 
        // When the button is clicked 
        let btn=document.querySelector("#button");
         
        btn.addEventListener('click', object.func);
        btn.addEventListener('click', object.output);
    </script>
</body>
 
</html>

                    

Output:

Reference: https://docs-lodash.com/v4/bind-all/



Last Updated : 13 Nov, 2023
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