How the Answer is 0?

Question

var arr=[];
for(i=2;i>0;i--){
arr[i]=i;}
document.write(arr.length* i);
//Ans: 0

Answer 1

Because i = 0, when you do arr.lenght*i you're multiplying by 0.

Answer 2

If you create an array if length 3, it will have length 3 even if one or more elements are undefined.

The length of an array describes how many "slots" it has, independent of the data in it.

Answer 3

Mohammad Tausiful Alam
Outside the loop i becomes 0 even though inside the loop it is reported as having a final value of 1. If you want the actual length of the array use:
document.write(arr.length);

not:
document.write(arr.length* i);

Answer 4

On each iteration, print the array and i to see their values.

Answer 5

Got it.I really appreciate all of u.
Thanks

Answer 6

At the the of the for loop, the value of i becomes 0 (i--) , multiplying any number by 0 gives 0

Answer 7

Good

Answer 8

Lisa, Edgar Sabido, Scott D
But console.log(arr[0]) is undefined.
Can undefined things be an array element?

Answer 9

Multiplying by 0 is always 0.

Answer 10

Get your out put inside the loop and try