jQuery | grep() Method - GeeksforGeeks

16 Apr, 2020
This grep() method in jQuery is used to finds the elements of an array that satisfies a filter function.
Syntax:
jQuery.grep(array, function(element, index) [, invert])

Parameters: This method accepts two parameters as mentioned above and described below:
array: This parameter holds the array like object for searching.
function(element, index): It is the filter function which takes two arguments, element which holds the element of the array and index which holds the index of that particular element.
invert: It is false or not passed, then the function returns an array having all elements for which “callback” returns true. If this is passed true, then the function returns an array having all elements for which “callback” returns false.
Return Value: It return the elements which satisfies the filter function.
Example 1: In this example, the grep() method is applies on the array of numbers to filter some numbers based on the condition. It doesn’t affect the original array.
<!DOCTYPE html> <html>  <head>     <title>         JQuery | grep() method    </title>          <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">    </script></head>  <body style="text-align:center;">           <h1 style="color:green;">         GeeksforGeeks     </h1>           <p id="GFG_UP" style =        "font-size: 20px; font-weight: bold">     </p>          <button onclick = "GFG_Fun();">         click here     </button>           <p id="GFG_DOWN" style = "font-size: 26px;            font-weight: bold; color: green;">     </p>           <script>         var up = document.getElementById('GFG_UP');        var down = document.getElementById('GFG_DOWN');                  var arr = [ 1, 9, 3, 8, 6, 1, 5, 9,                    4, 7, 3, 8, 6, 9, 1 ];                              up.innerHTML = "Click on the button to "                + "perform the operation.<br>"                + "Array - <br>[" + arr + "]";                          function GFG_Fun() {            var d = $.grep(arr, function( n, i ) {                return ( n !== 7 && i > 4 );            });                          down.innerHTML = JSON.stringify(d);        }     </script> </body>   </html>
Output:
Example 2: In this example, the grep() method is applies on the array of JavaScript objects to filter out some objects based on the condition. This method doesn’t affect the original array.
<!DOCTYPE html> <html>      <head>     <title>         JQuery | grep() method    </title>          <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">     </script></head>  <body style="text-align:center;">           <h1 style="color:green;">         GeeksforGeeks     </h1>           <p id="GFG_UP" style=        "font-size: 20px; font-weight: bold">     </p>          <button onclick = "GFG_Fun();">         click here     </button>          <p id="GFG_DOWN" style="font-size: 26px;        font-weight: bold; color: green;">     </p>           <script>         var up = document.getElementById('GFG_UP');        var down = document.getElementById('GFG_DOWN');                  var data = [            {"prop_1":"val_11", "prop_2":"val_12"},            {"prop_1":"val_21", "prop_2":"val_22"},            {"prop_1":"val_11", "prop_2":"val_22"},            {"prop_1":"val_61", "prop_2":"val_52"},            {"prop_1":"val_21", "prop_2":"val_52"},            {"prop_1":"val_61", "prop_2":"val_12"}        ];                  up.innerHTML = "Click on the button to "                + "perform the operation.<br>"                + "JSON - <br>" + JSON.stringify(data);                          function GFG_Fun() {            var d = $.grep(data, function(n, i){                return n.prop_1==='val_11';            });                          down.innerHTML=JSON.stringify(d);        }     </script> </body>  </html>
Output:
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