What will be answer?

Question

var arr=[1,4,6,4,2];
for (var i = 0; i < 3; i++) {
arr[i]+=arr[i+2]
}
alert(arr[0])

Answer 1

We are only interested in the first iteration (i=0). So we have:

arr[0] += arr [0+2]

This is equivalent to:

arr[0] = arr[0] + arr[0+2]

arr[0] is 1, arr[2] is 6, so we have:

arr[0] = 1 + 6
arr[0] = 7

Answer 2

arr[0] will be added with arr[2], hence the answer is 7.

Answer 3

a [i]=a [0]=1
a [i+2]=a [0+2]=a [2]=6

a [i]+=a [i+2]
a [0]=a [0]+a [2]=1+6=7

I hope this helps @Kristina
If you have further doubts, feel free to ask

Answer 4

The loop takes i from 0 to 2.

In the first iteration i equals 0, so the instruction goes:
a[0] += a[0+2], so it adds a[2] to a[0] (6 to 1, which gives 7)
Later, the loop goes through two other array elements, but in the end you just print a[0] which is equal to 7

Answer 5

If you are using Chrome under Windows just select code, ctrl-c, ctrl-shift-i, ctrl-v, enter

Answer 6

arr[0] = 1

in the loop when i = 0
arr[i] (arr[0] which is 1)+= arr[i + 2] (arr[0 + 2] which is 6)

Answer 7

7

Answer 8

var arr=[1,4,6,4,2];
for (var i = 0; i < 3; i++) {
arr[i]+=arr[i+2]
}
console.log(arr); // 7,8,8,4,2
Since arr[i]=arr[i]+arr[i+2]
for i=0
arr[0]=arr[0]+arr[2]; //arr[0]=1 arr[2]=6
arr[0]=1+6;
arr[0]=7;

Answer 9

don't understand how can added

Answer 10

but here I +2 6+2