An example during a stream

codewar-thingy.js

function spoonerize(words) {
  output = new Array();
  let wordList = words.split(' ');
  for (let i=0; i<wordList.length; i++) {
    let myWord = wordList[i].replace(/^./, wordList[wordList.length - i - 1][0]);
    output.push(myWord)
  }
  return output.join(' ');
}