Could you briefly explain why the correct answer to this question is 6?

Question

var arr=[5,7,2,6,3];
for(var c=1;c<=5;c+=2);//<--???
var x=arr[3];//6
x=(x%4);//%2
x*=2;//
c=(c%x);//%6
alert(arr[c]);

Answer 1

Let's split it line by line
at Line 1 it creates an array
And at 2nd line there is a for loop which ends with a semicolon; so the program will iterate var c till it meets the condition. At c=7 the condition returns false.. so the value of c is now 7.
At line 3.. var x equals to 6
At line 4.. var x changed to 2
At line 5.. var x is multiplied by 2 (using shorthand operator *= ) hence x=4
At line 6.. var c is changed to 3 (as 7%4)
At line 7.. array of 3 is 6. So it prints 6.

Answer 2

mmm... i'm just trying uncomplicate as the same way that you have writing first...

var arr=[5,7,2,6,3];

for(var c=1; c <= 5 ; c += 2)
// c=1 >> 3 >> 5 >> 7 stop

var x=arr[3]; // x=6
x=(x%4); // x= 6%4 =2
x*=2; // x= x*2 = 2*2 =4

c=(c%x); // c= 7%4 =3

alert(arr[c]); // arr[3] >> 6

Answer 3

Sami Khan Thank you for your uncomplicated explanation.