What
is the difference between call and apply?
CALL -
Call a function with the specified arguments. You can use call, if you know how many argument are going to pass to the functions.
Call a function with the specified arguments. You can use call, if you know how many argument are going to pass to the functions.
APPLY -
Call a function with argument provided as an array. You can use apply if you don't know how many argument are going to pass to the functions.
Call a function with argument provided as an array. You can use apply if you don't know how many argument are going to pass to the functions.
Both (call and apply) are using to call a
functions.
Here is an advantage over apply and call. The .call()
method is little bit faster than .apply() method.
Go to live demo example http://embed.plnkr.co/4Rb8Ur/preview
Example code as given below.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<link rel="stylesheet" href="style.css" />
<script>
var var1 = {my: "Obj1" };
var var2 = {my: "Obj2"};
function preview(par1, par2)
{
alert(this.my + ' ' + par1 + ' ' + par2);
console.log(this.my, par1, par2);
}
//using call as given below
preview.call(var1, "First", "Second"); //output: var1 First
Second
//using apply as given below
preview.apply(var2, ["First", "Second"]); //output: var2 First
Second
//using basic as given below
preview("First", "Second");//output: undefined
"First", "Second"
</script>
</head>
<body>
<div>
<h3>Refresh the page and
see the alert result or go to console window and see the result.</h3>
</div>
</body>
</html>
Thank you!
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Anil Singh is an author, tech blogger, and software programmer. Book writing, tech blogging is something do extra and Anil love doing it. For more detail, kindly refer to this link..
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