For Js Array. If you want to iterate over an object's keys, use for (var key i
If you want to iterate over an object's keys, use for (var key in object). Key characteristics of JavaScript arrays are: Elements: An array is a list of values, known as elements. length; i += 1). isArray () function is a dependable method to ascertain if a value is an actual array or not in JavaScript. In this example, person[0] returns John: Objects use names to access its "members". The original array will not be modified. The map() method does not execute the function for array elements without values. But, JavaScript arrays are best described as arrays. Arrays use numbers to access its "elements". Arrays are a special type of objects.