An if-not line gives a check its second path: when the check is true the first then-line runs, and if not, the other then-line runs instead. Exactly one path runs every time. Grown-up coders call the if-not line else.
20 blocks · 6 graded
19 blocks · 6 graded
20 blocks · 3 graded
16 blocks · 0 graded
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