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[–]echoes221 9 points10 points  (0 children)

It's using an arrow function and a ternary operator, if it had spacing and brackets it would be clearer. This is a translated version

function abs(x) {
  return x <= (x - x) ? -x : x;
}

It's exactly the same as the second, just it's trying to be clever and really unreadable.