Please specify a language. Help us help you. Closing.

Check your types!

Expected value is not a string but a number. (This could be more clear in the description.)

Also, .match() returns an array. Correct application of parseFloat() to an array would involve .map(). This is why you are getting NaNs. See http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map.

It made me realize that I have no idea on how to debug invisible string characters

I found you can use console.dir() on your result for this case or just test your function in browser's console.

Because there's no such thing as 0.2 cent as price.

Hi, the thing is that if the input string is empty, or if there is no match between your regexp and the input string str.match(/YOUR REGEXP/g) is going to return null instead of an array, so you can't execute join("") as a method of null. I think that's all I can say :). Good Luck

The Set constructor stores unique values, and accepts an iterable (like an Array or a Set) as its one argument. The construction removes duplicate values determined via the === operator.

var mySet = new Set([1, 1, 2, 3, 3]); // mySet contains: 1, 2, 3

The ... Spread operator can spread an iterable (like a Set or an Array) into multiple arguments or array elements.

var myArr = [...[1, 2, 3]] // myArr contains [1, 2, 3]
myFunc(...[1, 2, 3]) === myFunc(1, 2, 3)

A more verbose syntax for this solution might be:

function uniq(arr) {
  var objectWithUniqueArrayElements = new Set(arr);
  var arrayContainingSetsElements = [...objectWithUniqueArrayElements];
  return arrayContainingSetsElements;
}

More documentation if needed:

• Const
• Array Function (=>)

Your function fails when one of the arguments is null.
isFinite returns true for null, even though it is obviously not a number.