What is the usage of every() method in JavaScript?-HTML Tutorial-php.cn

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

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Release： 2023-09-01 23:05:06

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

JavaScript ArraysEach method tests whether all elements in the array pass the test implemented by the provided function.

The following are the parameters -

callback - the function used to test each element.
thisObject >− The object used as this when executing the callback.

Example

You can try running the following code to understand how to operate each () 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>

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