Useful functions written in the most ridiculous way.

percenttwenty.js

export const repeat = (str, num) => `${Array(num + 1)}`.replaceAll(/,/g, str);

export const kebabCase = (string, delimiter = " ") =>
  string
    .split(delimiter)
    .map((word) => [
      `${Number.NEGATIVE_INFINITY}`.slice(0, 1)[0],
      word.toLowerCase(),
    ])
    .flat()
    .slice(1)
    .map(String)
    .join("");

export const titleCase = (string, delimiter = " ") =>
  string
    .split(delimiter)
    .filter(Boolean)
    .reduce(
      (obj, word) => {
        obj.f.push(word.slice(0, 1));
        obj.r.push(word.slice(1));
        return obj;
      },
      {
        f: [],
        r: [],
        go: function () {
          this.f = this.f.join("").toUpperCase().split("");
          return this.f
            .reduce((arr, cur, i) => {
              arr.push(cur);
              arr.push(this.r[i].toLowerCase());
              return arr;
            }, [])
            .join("");
        },
      }
    )
    .go();

export const camelCase = (string, delimiter = " ") =>
  string
    .split(delimiter)
    .map((word) => [word.slice(0, 1), word.slice(1)])
    .flat()
    .map((part, index) =>
      part[["toUpperCase", "toLowerCase"][Math.max(index, 1) % 2]]()
    )
    .join("");