I read Is there a performance difference between i++ and ++i in C?:
Is there a performance difference between
i++and++iif the resulting value is not used?
What's the answer for JavaScript?
For example, which of the following is better?
for (var i = 0; i < max; i++) { // code } for (var i = 0; i < max; ++i) { // code } Here is an article about this topic: http://jsperf.com/i-vs-i/2
++i seems to be slightly faster (I tested it on firefox) and one reason, according to the article, is:
with i++, before you can increment i under the hood a new copy of i must be created. Using ++i you don't need that extra copy. i++ will return the current value before incrementing i. ++i returns the incremented version i.
No. There is no difference in execution time. The difference in the two code snippets is when i gets incremented.
for(i = 0; i < max; i++) { console.log(i); } This first example will yield the results: 0,1,2,3,...,max-1
for(i = 0; i < max; ++i) { console.log(i); } This second example will yield the results: 1,2,3,...,max
i++ increments the value after the operation. ++i increments the value before the operation.
There is no performance difference other than the one less iteration it will make on ++i because the increment is done before the first operation
var i = 0; alert(++i); vs var i = 0; alert(i++);
for(i = 0; i < max; ) console.log(++i) vs for(i = 0; i < max; ) console.log(i++)