Detecting Arrays


if (value instanceof Array){ 
  //do something on the array 
}

Array.isArray() method.


if (Array.isArray(value)){ 
//do something on the array 
}

 
<!DOCTYPE html>
<html>
<head>
    <title>Example</title>
    <script type="text/javascript">
        var colors = ["A", "B", "C"]; //creates an array with three strings 

        if (Array.isArray(colors)){ 
           document.writeln("colors is an array");
        } 
    </script>
</head>
<body>
</body>
</html>
Click to view the demo
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    Essential Types  

Array:
  1. The Array Type
  2. Array Built-in Methods
  3. Detecting Arrays
  4. Get and set array values
  5. Enumerating the Contents of an Array
  6. Array Length
  7. Array join() method
  8. Array concat()
  9. Array indexOf()
  10. Array lastIndexOf()
  11. Array every()
  12. Array filter() filters array with the given function.
  13. Array map()
  14. Array forEach()
  15. push() and pop():Array Stack Methods
  16. push(), shift():Array Queue Methods
  17. Array reduce()
  18. Array reduceRight()
  19. reverse():Reordering array
  20. Array slice()
  21. Array some()
  22. Array splice()
  23. Array sort()
  24. toString(), toLocaleString() and valueOf Array
  25. Array unshift()