'Looks like you've solved it'

.

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort

"To compare numbers instead of strings, the compare function can simply subtract b from a."

I was baffled why my test cases hadn't come through but realised where the correct input box was on the edit page, thanks for the heads up!

You should carefully walk through the logic you have built here and consider what the result will be in each possible test case you can imagine. For instance, remainder(0, -5) should actually return 0 (but it seems I missed that test case in the kata itself). In the case where the input values are equal, your logic ends up returning a || b, which doesn't make any sense.

Because the method will never modify anything. It's defined like this.

Take a look at Array#Iteration_methods to see how to use Array#some ( * and if maybe there's a better method to solve this kata * )

The method you're using doesn't modify the object. Instead, it returns a new one.

What do you get? A string. What do you return? A string. That's not what you're asked for, the kata asks for a number. The types don't match.

Hint: save or return the result of your function call.

@ZozoFouchtra: Marked your comment as spoiler.

hints:

• about arguments, you may use .length to get last one (like you use Array#length in your code : myArray[myArray.length - 1] )

• more info about if...else

} else (typeof list === 'string') {

. . . is a bad construction, you should use :

} else {

. . . or :

} else if ( other condition ) { 

Other than that don't forget there may be

• only 1 argument ( an array, a string )
• or more than 1 arguments. In this case "list" is only the first argument and last should return the last argument.

eg :

// -- only 1 argument --
last( [ 1, 2, 3 ] ) // -> 3
last( "abc" ) // -> "c"

// -- more than 1 --
last( 1, 2, 3 ) // -> 3
last( "abc", "ijk", "xyz" ) // -> "xyz"

Happy coding!

The Push basically pushes an element into the array here is some documentation on the method push

it creates a new array with the result of calling given function on every element of this array. Which it will add "Hello" + your arguments + "!"