maestro/src/util/titleize.js

Maestro is a framework for quickly bootstrapping serverless orchestration workflows with AWS Step Functions

const capitalize = require("./capitalize");

const special = new Set();
const specialArray = [
  "and",
  "or",
  "to",
  "of",
  "for",
  "in",
  "the",
  "a",
  "an",
  "nor",
  "but",
];

specialArray.forEach((word) => special.add(word));

const titleize = (str) => {
  if (str === "") return "";

  const words = str.split(/\s/);
  if (words.length === 1) {
    return capitalize(words[0]);
  }

  const middleWords = words.slice(1, words.length - 1);
  const firstWord = words[0];
  const lastWord = words[words.length - 1];
  const resultWords = [];

  resultWords.push(capitalize(firstWord));

  middleWords.forEach((word) => {
    word = word.toLowerCase();
    resultWords.push(special.has(word) ? word : capitalize(word));
  });

  resultWords.push(capitalize(lastWord));

  return resultWords.join(" ");
};

module.exports = titleize;