JSFiddle - React, Tailwind, and code Playground
JavaScript
let third = (str) => str.concat('_').match(/.{2}/g);
console.log(third('abc')); // Array [ "ab", "c_" ]
console.log(third('abcd')); // Array [ "ab", "cd" ]
let third = (str) => str.concat('_').match(/.{2}/g);
console.log(third('abc')); // Array [ "ab", "c_" ]
console.log(third('abcd')); // Array [ "ab", "cd" ]