abbreviate.js

const capitalize = word => word[0].toUpperCase() + word.slice(1).toLowerCase()

const abbreviate = (str, length=2) => {
  str = str
    .split(' ')
    .map(word => word.toUpperCase() === word ? capitalize(word) : word)
    .join(' ');

  const ret = [];
  str.replace(/([A-Z])/g, (match, p1) => {
    if (ret.length >= 2) return;

    ret.push(p1);
  });
  return ret.join('');
}

const testStrings = ['Test', 'The Test', 'Test Test', 'TestTest', 'TEST', 'CUR Media', 'CUR MEDIA', 'Clockwise.MD', 'Fresh8 Gaming', 'Numbers Personal Finance AG', 'Q CTRL Pty']
console.log(testStrings.map(abbreviate));