javascript return?

function e(){
  return 4, false;
}

e() 
// e () -> false
function f() {
  return 4 + 4, true;
}
f()
// f() -> true

Shouldn't I expect it to return 4 or sum of 4 + 4. Why every time my function e() and function f() return 2nd value?

Comments

[stereobooster]

The comma operator (,) evaluates each of its operands (from left to right) and returns the value of the last operand.

developer.mozilla.org/en-US/docs/W...

[abhishek]

Thank you. I actually got confused on left to right and right to left evaluate thing.

[Anders Persson]

return only returns 1 value, and it vould be the last,
if you like to return more then 1 value you can do this as a array

function e() {
return [4,false];
}

if you then like to get first part just type
e()[0];

[abhishek]

thank you it was really helpful. I saw this code in react, they had this long complex return with , so I thought what the use of it?

[Coderslang: Become a Software Engineer]

what's the desired behavior of these functions?