javascriptScope errorMedium

Result variable that vanishes after the loop

Time: 0:00

What it should do

findFirstNegative(nums) should return the first negative number in the array, or null if there isn't one.

What goes wrong

Calling findFirstNegative with any array throws: ReferenceError: result is not defined.

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.