What is the difference between call and apply in javascript?

In Javascript, call() and apply() are predefined methods. Both methods can be used to invoke a function & must have the owner object as first parameter. See More detail below:


apply lets you invoke the function with arguments as an array.
View Example:

            function myFunction1(a, b) {
                return a + b;
            }
            var myobj1 = new Object();
            var result1 = myFunction1.call(myobj1, 5, 6);
            console.log('Result with call function: ' + result1);

call requires the parameters be listed explicitly one by one.
View Exmple:

            function myFunction2(a, b) {
                return a + b;
            }
            myArray = [5, 6];
            var myobj2 = new Object();
             var result2 = myFunction2.apply(myobj2, myArray);   
             console.log('Result with Apply function: ' + result2);

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How to Include a JavaScript file in another JavaScript file?

Including a javascript file in another javascript file is common in web development.
Because many times we include the javascript file at run time on the behalf of some conditions.

So, we can achieve this using javascript as well as using jQuery.


Method 1: Use JavaScript to include another JavaScript file.
Step 1: Add following function in web page.

function loadScript(url)
{    
    var head = document.getElementsByTagName('head')[0];
    var script = document.createElement('script');
    script.type = 'text/javascript';
    script.src = url;
    head.appendChild(script);
}

Step 2:just call the below loadScript function, Where you want to include the js file.

 loadScript('/js/jquery-1.7.min.js');

Method 2: Use jQuery to include another javasScript file .
Step 1: Add jQuery File in your webpage.
<script src="//code.jquery.com/jquery-1.11.2.min.js"></script> Step 2: Just call the  getScript  function functions.

 jQuery(document).ready(function(){
    $.getScript('/js/jquery-1.7.min.js');
});

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