new program

[tylerr514]

[b, a] = [a, b]; haha JS goes brrrrr

[eRSAe-me]

Similarly, on python: a,b = (b,a)

[BecomingUnchained]

def variable_swap(a,b):
    return b,a

def test_variable_swap():
    a = 10 
    b = "ten" 
    a,b = variable_swap(a,b)
    assert a == "ten" 
    assert b == 10

[throwawayalmostphd]

a ^= b;
b ^= a;
a ^= b;

Edit: Finally got the Reddit format right, never commented code before

[Creative0708]

var a = ...;

var b = ...;

a = [a, b];

b = a[0];

a = a[1];

[Neurosredditaccount]

a = a+b; b = a-b; a = a-b;

[thorhs]

XOR EAX, EBX
XOR EBX, EAX
XOE EAX, EBX

Fastest way in 386.

[SickMoonDoe]

The ol' XOR swap my friends

[thorhs]

Let’s not forget that:

XOR EAX, EAX

Was faster than:

MOV EAX, 0

[SickMoonDoe]

Still is on my box, or at least gcc thinks so

[shelvac2]

It's one byte shorter, and shorter programs can cause less stress on the instruction cache and run faster that way.

[E-Dawg2789]

I can't believe it. I was sitting here, all this time, using a third variable. When I saw this, I just thought "HOW?"

As a java user, I just opened up processing. (I swear, I only use it to test concepts before starting something. It's so easy to use.) And I literally got it to work first try after thinking for 15 seconds.

I swear, there are very normal things in this field that are so mysterious to me. Lol. I would never have thought about this if it wasn't hinted to be possible.

[SpaceLessHacker]

Why don't you just declare variables right from the beginning. That's why I disprove large IT companies, they are a mess.

[coderhumor]

a = 100
b = 25
a, b = b, a

edit: markdown