Get abbreviation from the string by comparing start of the string. Useful for creating convenient TypeScript enum names.

get-abbreviation-from-string-start-similarity.ts

const s = [
  "ApiAuthTypeFacebook",
  "ApiAuthTypeGoogle",
  "ApiAuthTypeLinkedIn",
  "ApiAuthTypeGithub",
];

function getAbbreviationFromStartSimilarity(s: string[]) {
  let match = "";
  for (const n of s) {
    for (const n2 of s) {
      for (let i = 0; i < n.length; i++) {
        const slice = n.substring(0, n.length - 1 - i);
        if (n2.startsWith(slice) && s.every((n) => n.startsWith(slice)) && slice.length > match.length) {
          match = slice;
        }
      }
    }
  }
  return s.map((l) => l.substring(match.length));
}

/**
 * output of the call below is:
 * ['Facebook', 'Google', 'LinkedIn', 'Github']
 */
console.log(getAbbreviationFromStartSimilarity(s));