Array every()

every() accepts two arguments:

a function to run on each item
an optional scope object.

every() runs the given function on every item and returns true if the function returns true for every item. every() does the query against the array for matching criteria with the passed in function.

The function passed in receives three arguments:

the array item value,
the position of the item in the array
the array object itself.

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
        var numbers = [1,2,3,4,5,4,3,2,1]; 
        
        var everyResult = numbers.every(function(item, index, array){ 
            return (item > 2); 
        }); 
        
        document.writeln(everyResult); //false 
       
    </script>
</head>
<body>
</body>
</html>

Click to view the demo

every() does not change the values contained in the array.