Sort an Array Alphabetically using the sort Method -- trying to understand

Curriculum Help
1

Tell us what’s happening:

Can someone explain me step by step what is this line doing:

return a === b ? 0 : a < b ? -1 : 1;

Your code so far


function alphabeticalOrder(arr) {
// Only change code below this line
return arr.sort(function(a,b) {
  return a === b ? 0 : a < b ? -1 : 1;
});

// Only change code above this line
}
alphabeticalOrder(["a", "d", "c", "a", "z", "g"]);

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Challenge: Sort an Array Alphabetically using the sort Method

Link to the challenge:

2

Hello @maxi1225,

Let me explain this. return just means return,

  • a === b Checks if a === b
  • ? 0 if a === b returns truthy, then it’s going to return 0
  • : a < b If a === b returns falsey, then it’s gonna ask again if a < b
  • ? -1 If a < b returns truthy, then it’s going to return -1
  • : 1 If a < b returns falsey, then it’s going to return 1
/* this is called a Ternary operator. It is a shorter version of 
If() block. It's used if you know the test is only return truthy (true) or falsey (false) */
test ? truthy : falsey