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What is the usage of every() method in JavaScript?

JavaScript array every method tests whether all the elements in an array passes the test implemented by the provided function.

The following are the parameters −

  • callback − Function to test for each element.
  • thisObject − Object to use as this when executing the callback.

Example

You can try to run the following code to learn how to work with every() method in JavaScript −

<html>
   <head>
      <title>JavaScript Array every Method</title>
   </head>

   <body>
      <script>
         if (!Array.prototype.every) {
            Array.prototype.every = function(fun /*, thisp*/) {
               var len = this.length;
               
               if (typeof fun != "function")
               throw new TypeError();
               var thisp = arguments[1];
               
               for (var i = 0; i < len; i++) {
                  if (i in this && !fun.call(thisp, this[i], i, this))
                  return false;
               }
               return true;
            };
          }
          function isBigEnough(element, index, array) {
             return (element >= 10);
          }
          var passed = [12, 5, 8, 130, 44].every(isBigEnough);
          document.write("First Test Value : " + passed );
          passed = [12, 54, 18, 130, 44].every(isBigEnough);
          document.write("<br>Second Test Value : " + passed );
      </script>
   </body>
</html>
Updated on 02-Mar-2020 06:39:43

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