if is of type array code example

Example 1: javascript determine array type

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

Example 2: js is of type array

Array.isArray([1, 2, 3]);  // true
Array.isArray({foo: 123}); // false
Array.isArray('foobar');   // false
Array.isArray(undefined);  // false