We have some fundamental issues with new Array() the example in detail for array constructor function as given below.

When array have more the ONE integer?
var newArray = new Array(10, 20, 30, 40, 50);
console.log(newArray[0]); //RETURNS 10.
console.log(newArray.length); //returns 5.

When array have only one integer?
var newArray = new Array(10);
console.log(newArray[0]); //returns undefined
console.log(newArray.length); //returns 10 because its has an error "array INDEX out of bound";
//This is the fundamental deference to need to avoid the new array();

We have some fundamental issues with new Array() the example in detail for array constructor function as given below.

When array have more the one integer?
var newArray = new Array(10, 20, 30, 40, 50);
console.log(newArray[0]); //returns 10.
console.log(newArray.length); //returns 5.

When array have only one integer?
var newArray = new Array(10);
console.log(newArray[0]); //returns undefined
console.log(newArray.length); //returns 10 because its has an error "array index out of bound";
//This is the fundamental deference to need to avoid the new array();