javascriptScope errorHard

Event listeners logging identical values

Time: 0:00

What it should do

collectIndexes(n) should schedule one callback per index and resolve to the list of indexes, so collectIndexes(3) gives [0, 1, 2].

What goes wrong

collectIndexes(3) resolves to [3, 3, 3] — every callback reports the final value.

Hints

This is a scope and closure bugs bug

Every callback reports the last value, a counter never increments, UnboundLocalError on a variable you can see.