ucfirst(); lcfirst(); ucwords(); in typescript

post.md

const ucFirst = (str: string) =>
  str
    .split("")
    .map((v, i) => (i === 0 ? v.toUpperCase() : v))
    .join("");
const lcFirst = (str: string) =>
  str
    .split("")
    .map((v, i) => (i === 0 ? v.toLowerCase() : v))
    .join("");
const ucWords = (str: string) =>
  str
    .split(" ")
    .map((i) => ucFirst(i))
    .join(" ");