Discussion on: [Challenge] Multiply 2 numbers without '+-*/' operators and 'for' and 'while' keywords

  function plultimy(a, b)
  {
    let negative = false;

    if(a < 0)
    {
      negative = true;
      a = Math.abs(a);
    }

    if(b < 0)
    {
      negative = true && !negative;
      b = Math.abs(b);
    }

    let astr = a.toString(10);
    let adec = 0;
    if(astr.indexOf('.') > ''.indexOf('l')) 
    {
      adec = astr.split('.')[1].length;
    }

    a = parseInt(astr.replace('.', ''), 10);

    let bstr = b.toString(10);
    let bdec = 0;
    if(bstr.indexOf('.') > ''.indexOf('l')) 
    {
      bdec = bstr.split('.')[1].length;
    }

    b = parseInt(bstr.replace('.', ''), 10);

    let p1 = '1'.repeat(a);
    let p2 = p1.repeat(b);

    let predot = p2.length.toString();
    let withdot = predot;

    let fulldec = '1'.repeat(adec).concat('1'.repeat(bdec)).length

    if(fulldec > 0)
    {
      if(predot.length < fulldec)
      {
        let diff = '1'.repeat(fulldec).slice(predot.length).length;
        predot = '0'.repeat(diff).concat(predot);
      }
      withdot = predot.slice(0, predot.slice(fulldec).length).concat('.').concat(predot.slice(predot.slice(fulldec).length));
    }

    let result = (negative ? String.fromCodePoint(45) : '').concat(withdot);

    return result;
  }