D3 Examples - Advent of Code 2018: day 1 (part 2)

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    d3.tsv('input.tsv', function(raw){
      
      var data = []
      
      
      raw.forEach(function(value){
          data.push(+value.input) // change to signed integer
      })
      
      var freqTracking = []
      var found;
      var sum = 0;
      var firstRepeatedFreq;
      
      freqTracking.push(0)
      
      console.log(data)
      
      do {
      
        for (var i = 0; i < data.length; i++) {
          
          sum = sum + data[i]
          
          // search in list
          firstRepeatedFreq = freqTracking.find(function(num){
            return num === sum
            
          })
          
          console.log(firstRepeatedFreq)
         
          // flag if found
          if (firstRepeatedFreq !== undefined){
            found = firstRepeatedFreq
            break;
          }
            
            
          // add to list
          freqTracking.push(sum)
            
                console.log("found:" + found)
        }
        
      } while (firstRepeatedFreq === undefined)
      
      
        })  
​
  </script>
</body>
​
    