$.map Vs. $.grep in jQuery
The difference is that the grep() method filters an array and returns the filtered array, while map() method applies a function to each item in the array, thus returning a modified array.jQuery map() method
The map() function translates a set of elements in the jQuery object into another set of values in a jQuery array which may, or may not contain elements.
var items = [10,20,30,10];
var items = $.map(items, function(item) {
if (item == 10)
return null;
return item;
});
In the above code will return 20 and 30.

<!DOCTYPE html>
<html lang="en">
<head>
<title>jQuery map() method</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('button').click(function() {
var items = [10,20,30,10];
alert(items);
var items = $.map(items, function(item) {
if (item == 10)
return null;
return item;
});
alert(items);
});
});
</script>
</head>
<body>
<button>Try it</button>
</body>
</htm>
jQuery grep() method
The jQuery grep() method is used to filter the contents of an array.
var items = [10,20,30,10];
var items = $.grep(items, function(item) {
return item != '10';
});
In the above code willreturn 20 and 30.

<!DOCTYPE html>
<html lang="en">
<head>
<title>jQuery grep() method</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function(){
$('button').click(function() {
var items = [10,20,30,10];
alert(items);
var items = $.grep(items, function(item) {
return item != '10';
});
alert(items);
});
});
</script>
</head>
<body>
<button>Try it</button>
</body>
</html>
So, we can see here the difference is grep() method filters an array and returns the filtered array, while map() method applies a function to each item in the array, thus returning a modified array.
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