anchor.diff:      var className = isActive ? 'is-active' : ''
       .App-nums-num(className=className)= n
   
  +var res = state.numsStatus && Object.keys(state.numsStatus).length && state.res || '-'
   var className = state.isCorrect ? 'is-active' : ''
  -.App-result(className=className)= state.res || '-'+.App-result(className=className)= res
positive.code: header.App-header
    h1.App-header-heading math24
    button.App-header-generate(onClick=this.onGenerate) generate
    
  input.App-input(onChange=this.onChange autoFocus placeholder='Combine the numbers below to make 24')
  
  .App-nums
  
negative.code:     var val = ev.target.value;
      var nums = this.state.nums.slice();
      var numsArr = val
        .replace(/[\+\*\-\//\(\)\s]/g, ',')
        .split(',')
      var numsStatus = numsArr
        .reduce((acc, next, idx) => {
  