6kyu-unique-in-order.js

// Implement the function unique_in_order which takes as argument a sequence and returns a list of items without any elements with the same value next to each other and preserving the original order of elements.

// For example:

// uniqueInOrder('AAAABBBCCDAABBB') == ['A', 'B', 'C', 'D', 'A', 'B']
// uniqueInOrder('ABBCcAD')         == ['A', 'B', 'C', 'c', 'A', 'D']
// uniqueInOrder([1,2,2,3,3])       == [1,2,3]

let uniqueInOrder = function(iterable) {
        //your code here - remember iterable can be a string or an array

        return [...iterable].filter((value, index, array) => value !== array[index - 1]);
};