Codewars 7 Kyu Make A Function That Does Arithmetic Javascript

Summary

this one uses a switch statement kata link: this one uses the join() method join() info: ... this one uses a double for loop, the reduce() method, and more kata link: ... this one uses the trim() method trim() info: ... this one uses currying and the map() method kata link: this one uses a while loop, the Array.from() method, and more kata link: ... this one uses the Set() object, the map() method, and more Set() info: ... this one uses the Array.from() method and the ternary operator kata link: ... this one uses the String() constructor, spread syntax(...), and more kata link: ... this one uses the split() method, the this one uses destructuring assignment syntax,