3 ms·

Unless you’re testing if something is null or undefined, in which case a single “x != null” handles it.

• fzzzy 3y ago
  Sure. I usually just use !x for that.
  • SamBam 3y ago
    That doesn't test if it's null or undefined, that just tests if it's not falsy. x = 0; !x → true y = ""; !y → true z = null; !z → true