javascriptScope errorMedium

Counter stuck at zero

Time: 0:00

What it should do

countMatches(words, target) should count how many times target appears, so countMatches(["a","b","a"], "a") returns 2.

What goes wrong

countMatches(["a","b","a"], "a") returns 0 — nothing is ever counted, even though the matches clearly exist.

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.