Array.length vs Array.prototype.length [duplicate]

Question

I found that both the Array Object and Array.prototype have the length property. I am confused on using the Array.length property. How do you use it?

Console.log(Object.getOwnpropertyNames(Array));//As per Internet Explorer

outputs:

length,arguments,caller,prototype,isArray,

Prototype and isArray is usable but how do you use the length property?

Answer 1

Array is a constructor function.

All functions have a length property that returns the number of declared parameters in the function definition.

Answer 2

Array.length is how many arguments the function Array() takes and Array.prototype.length is an instance method that gives you the length of your array. When you check ['foo'].length you're actually checking Array.prototype.length with the this argument being your array ['foo']

var myArray = ['a','b','c']
console.log(myArray.length); //logs 3