Why is i++ different from i+1?

You're incrementing by one. I don't see the difference...

[1337Mac]

I was playing with this example on W3 Schools...

[w3schools.com...]

and I noticed that if you change the i++ part of the script to i+2 or even i+1 it causes an infinite loop.

Why on Earth would that be?

[1337Mac]

Wait...
is it because you need to type i=i+1;
?

[1337Mac]

D'oh! Yes... I understand now. Sorry for the n00b question.

[DrDoc]

i++

is short for

i = i + 1

, or

i += 1

. Simply saying

i + 1

does not actually increase the value of

i

.

for(i = 0; i < 5; i++) { 
  document.write(i); 
} 
for(i = 0; i < 5; i+=1) { 
  document.write(i); 
} 
for(i = 0; i < 5; i+=2) { 
  document.write(i); 
}

Those are all viable options.

[astupidname]

If you need the next level of understanding how incrementing of variables works, you may be interested in this thread also:
complete newbie - increments [webmasterworld.com]

[1337Mac]

Thank you both.

@astupidname: I browsed that thread (being a newbie I felt it was my duty) and I did learn something new! : Didn't realize you could do y=++x

[jalarie]

Also notice that i++ can produce different results from what you get with i+=1. The i++ forces i to be numeric and then adds 1 to it; the i+=1 may, in some situations, think that i is a character string and tack a 1 on the end.

[coopster]

Not to add confusion, but perhaps some enlightenment -- if you ever come across a single plus sign in front of a variable you are likely viewing an example of the unary [webmasterworld.com] operator.