title: Find Max Values of Elements in Nested Object Inside Array
body: <p>I have a multidimensional array that looks like:</p>
  <pre><code>[ { j: 15, temps: 33.55, pressureVal: 1021, cloudCover: 95 },
    { j: 16, temps: 34.05, pressureVal: 1019, cloudCover: 98 },
    { j: 16, temps: 32.14, pressureVal: 1018, cloudCover: 99 },
    { j: 16, temps: 32.16, pressureVal: 1016, cloudCover: 100 },
    { j: 16, temps: 32.68, pressureVal: 1014, cloudCover: 100 },
    { j: 16, temps: 32, pressureVal: 1015, cloudCover: 99 },
    { j: 16, temps: 33.53, pressureVal: 1016, cloudCover: 92 },
    { j: 16, temps: 37.06, pressureVal: 1017, cloudCover: 89 },
    { j: 16, temps: 37.69, pressureVal: 1016, cloudCover: 48 },
    { j: 17, temps: 34.86, pressureVal: 1017, cloudCover: 71 },
    { j: 17, temps: 33.78, pressureVal: 1019, cloudCover: 60 },
    { j: 17, temps: 33.53, pressureVal: 1019, cloudCover: 57 },
    { j: 17, temps: 32.45, pressureVal: 1019, cloudCover: 14 },
    { j: 17, temps: 32.61, pressureVal: 1019, cloudCover: 26 },
    { j: 17, temps: 36.5, pressureVal: 1019, cloudCover: 93 },
    { j: 17, temps: 39.13, pressureVal: 1018, cloudCover: 97 },
    { j: 17, temps: 39.74, pressureVal: 1017, cloudCover: 100 } ]
  </code></pre>
  <p>I need to find the max value of temps, pressureVal and cloudCover for each different j value.  Any ideas how to work with this type of data structure?</p>