What would be the difference between
var nums = [];
for (var i = 0; i < 10; ++i) {
nums[i] = i+1;
}
and
var nums = [];
for (var i = 0; i < 10; i++) {
nums[i] = i+1;
}
In the for loop, i = 0, but in the first iteration, would nums[i] = nums [0] or nums [1] since we are using ++i? How would the first iteration be different if i++ were used instead?
Update: For this particular for loop it doesn't matter. However, I'm interested to see a for loop where ++i vs i++ matters.
They would be exactly the same; ++i and i++ have the same effect on i, but the value of each expression is different; in this context, since the value is ignored, the code behaves the same.
As an example where switching between the two would matter, here is some truly awful code:
for ( var i=0; i++ < 10; )
++i increments before the "return", i++ increments after
var i = 0;
i++; //=> 0
i; //=> 1
var j = 0;
++j; //=> 1
j; //=> 1
For the purposes of your for loop, it doesn't make a difference.
In for loops, there is no difference. The difference between ++i and i++ is the value returned by the expression, but the expression is evaluated after each pass of the loop and you ignore the value.
There is no difference between the two. The incremented value will be ignoreed as it will happen at the end of the loop.
EDIT:
It makes no difference in the for loop if you write
for (var i = 0; i < 10; ++i) {
or
for (var i = 0; i < 10; i++) {
You will get the same results in both the cases. The reason why most of the people use i++ or better to say why i++ is more popular over ++i in a for loop is probably because people come from a habit of using i++ which was majorly used in C. Also to note that in C++ you can write your own version of ++ operator.
They are the same. The increment occurs at the end of the body of the loop.
i.e. you can view the loop as
var i = 0;
while (i < 10) {
... Body of loop
i++ or ++i;
}
