Could someone explain me how this code works line to line? Thanks.

Question

function findl(v,t){
for(var i=0;i<v.length;++i){
if (v[i]==t){return i;}
}
return -1;
}
var a=findl([3,2,1,4,5],4);
alert(a);

Answer 1

Rastislav Romanec
Inside the loop declaration prototype,

The initial value of i is 0, the condition to check is i < 5 (5 is the length of array v, passed argument to parameter v). The loop increments by 1 on each iteration.

Inside the loop body,

The if statement checks whether the element in the array v at index i is equal to parameter t (which is 4). The element at 3th index (when i becomes 3) is 4, and it has the same value as variable t. Therefore, 3 gets printed.

Answer 2

Is it "v.length" instead of "length"?

Answer 3

yes, it is.