Run results for: Phone Numbers

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Theirs	910271000.0 Ops/sec
Mine	891802100.0 Ops/sec

Tests:

Theirs
const L = {'2':"abc",'3':"def",'4':"ghi",'5':"jkl", '6':"mno",'7':"pqrs",'8':"tuv",'9':"wxyz"} var letterCombinations = function(D) { let len = D.length, ans = [] if (!len) return [] const dfs = (pos, str) => { if (pos === len) ans.push(str) else { let letters = L[D[pos]] for (let i = 0; i < letters.length; i++) dfs(pos+1,str+letters[i]) } } dfs(0,"") return ans };
Mine
const phonePad = { 0: [''], 1: [''], 2: ['a', 'b', 'c'], 3: ['d', 'e', 'f'], 4: ['g', 'h', 'i'], 5: ['j', 'k', 'l'], 6: ['m', 'n', 'o'], 7: ['p', 'q', 'r', 's'], 8: ['t', 'u', 'v'], 9: ['w', 'x', 'y', 'z'] }; var letterCombinations = function(...nums) { const first = nums.shift(); const options = nums.reduce((acc, cur) => { let strings = []; for (const str of acc) { for (const letter of phonePad[cur]) { const s = `${str}${letter}`; strings.push(s); } } return strings; }, phonePad[first]); return options; }