Answers for "check if object is array"

javascript determine array type

var data = ['a', 'b', 'c']
var isArray = Array.isArray(data)
console.log(isArray)

if object is array javascript

Array.isArray(object);

js check if array

Array.isArray([1, 2, 3]);	// true
Array.isArray('asdf');		// false

check object in array javascript

var obj = {a: 5};
var array = [obj, "string", 5]; // Must be same object
array.indexOf(obj) !== -1 // True