Good use of type coercion :) very clever.

I passed this only checking fot month = 11, I didn't even remember to check for the day until I saw the other answers!

I did the exact same thing, but deleted my comment before submiting xD

Well TIL that number * true === numberand number * false === 0 hehe

Yet is the most voted answer, I don't understand it either.

A better way to go through an array or object is:

for(var i in array)

That will go throug each element of the array (or object), i will be the index 0, 1, 2, 3.. in case of an array and the properties in case of an object.

We have the same solution, but I used this shortcut.

You are saying: if this is true return true. if it is false, return false.

Much shorter to just return the comparition itself

return ending === str.slice(-1*(ending.length))

Also you could omit the else keyword as it will never execute code after the first return.

You won't find a better example than this to start.

var mind = "blown";

I had troubles with

if (!people[i].wasNice)

Not passing the test, I had to change it to

if (people[i].wasNice === false)

:/

But in this case was a thing of copy pasting the exact same code in the given documentation. Didn't like, didn't learn anything :(

I looped trough "aeiouAEIOU" xD