What hint do you recommend?

Details states: "To make things simpler, it will only have to deal with simple values and objects and arrays containing strings, booleans and numbers, without taking into account regular expressiones, dates and functions"

One of the submit tests includes an array with an object.
[ 1, 2, null, undefined, { name: 'Joe' } ]

I recommend to 1) update the detail to state arrays containing objects, string, booleans, and numbers or 2) remove the test.

Many thanks for looking over my code and spotting this :)

Can someone give insights into the below test spec:

"Returns names of two arguments for a function that takes in two arguments, written in another way - Expected: ["a","b"], instead got: []"

Totally agree - the confusion is with how the Date object works whereby months start from 0 (January) and not 1 (February)

In the instructions the first test shows the result as 'dbca' when it should be 'dcba'.

Test.assertEquals(reverse("abcd"),"dcba","Reverse abcd");

Thanks for sharing that tip. I found a really nice explanation of currying here: http://www.drdobbs.com/open-source/currying-and-partial-functions-in-javasc/231001821?pgno=2

For this spec "Result - what is expected: 2 decimal places precision NUMBER.", I am trying to use .toFixed(2). None of the tests are passing, does anyone have any recommendation?

Thanks a bunch, will keep that in mind :)