Discussion on: The difference between x++ and ++x

[Frank Puffer]

Yes, the main issue is mutability. The ++ operator is actually a hidden assignment. In most modern languages there are few use cases for incrementing variables, mainly because they provide better ways for looping over collections. However I sometimes have to maintain legacy C code where I don't want to miss ++ in for loops.

I believe that += is only slightly better when it comes to copy/paste errors. You can also do this (at least in C++ and Java - not sure about JS):

while ( ... ) {
    doStuff(a[i += 1]);
    console.log(a[i += 1]);
}

But it looks weird and will hopefully be noticed soon.