JavaScript Array every() method

The JavaScript array every() method is used to determine whether all the elements of an array are satisfying the provided function conditions.

Syntax:

array.every (callback (currentValue, index, arr), thisArg)

Parameters:
callback: It represents the method to test the condition. It is required.
currentValue: It represents array’s current element. It is required.
index: Current element index. It is optional.
arr: It represents the array on which every() method to be invoked. It is optional.
thisArg: It is used as this keyword while executing callback. It is optional.

Returns:
Return true if all the elements of an array are satisfying the specified conditions else return true.

Example:

<!DOCTYPE html>
<html>
<head>
</head>
<body>
<script>  
var a = ["GOLD","SILVER","DIAMOND","RUBY","PLATINUM"]
function check(value)  
{  
  return value == "RUBY";   
}   
document.writeln(a.every(check));  
</script>  
</body>
</html>

Output:

false
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