Split a string into words with or without single spaces, where multiple subsequent spaces are considered words.

SplitIntoWordsParser.js

/*
  Split a string into words with or without single spaces, 
  where multiple subsequent spaces are considered words.
*/

function parseWords(txt, includeSingleSpaces = false) {
  let result = [txt[0]];
  txt = txt.slice(1).split('');
  
  while (txt.length) {
    const last = result[result.length - 1].at(-1);
    
    if (txt[0] === ` ` && last === ` ` || txt[0] !== ` ` && last !== ` `) {
      result[result.length - 1] += txt.shift();
      continue;
    }

    if (last !== ` ` && txt[0] === ` ` || last === ` ` && txt[0] !== ` `) {
      result.push(txt.shift());
      continue;
    }

    result[result.length - 1] += txt.shift();
    result.push(txt.shift());
  }
  
  return includeSingleSpaces ? result : result.filter(v => v !== ` `);
}