Switch case || JS Hackerrank Solution

 Complete the getLetter(s) function in the editor. It has one parameter: a string, s, consisting of lowercase English alphabetic letters (i.e., a through z). It must return A, B, C, or D depending on the following criteria:

If the first character in string s is in the set {a, e, i, o, u}, then return A.If the first character in string s is in the set {b, c, d, f, g}, then return B.If the first character in string s is in the set {h, j, k, l, m}, then return C.If the first character in string s is in the set {n, p, q, r, s, t, v, w, x, y, z}, then return D.

Hint: You can get the letter at some index i in s using the syntax s[i] or s.charAt(i).

Solution

'use strict';      process.stdin.resume();     process.stdin.setEncoding('utf-8');     let inputString = '';   let currentLine = 0;     process.stdin.on('data', inputStdin => {     inputString += inputStdin;   });     process.stdin.on('end', _ => {     inputString = inputString.trim().split('\n').map(string => {         return string.trim();     });         main();      });     function readLine() {     return inputString[currentLine++];   }     function getLetter(s) {     let letter;         switch(true){         case "aeiou".includes(s[0]):         letter="A";         break;         case "bcdfg".includes(s[0]):         letter="B";         break;         case "hjklm".includes(s[0]):         letter="C";         break;         case "npqrstvwxyz".includes(s[0]):         letter="D";         break;              }                 return letter;   }