Binning an array in javascript for a histogram

Question

I have below array in Javascript which I need to bin into 20 buckets. The data values are between 0 and 1, so the bin size would be .05. I feel like there should be a functi

Answer 1

You could make the bins yourself using some JS:

var arr = [
  "0.362743", "0.357969", "0.356322", "0.355757", "0.358511",
  "0.357218", "0.356696", "0.354579", "0.828295", "0.391186",
  "0.378577", "0.39372", "0.396416", "0.395641", "0.37573",
  "0.379666", "0.377443", "0.391842", "0.402021", "0.377516",
  "0.38936", "0.38936", "0.400883", "0.393171", "0.374419",
  "0.400821", "0.380502", "0.396098", "0.388256", "0.398968",
  "0.392525", "0.401858", "0.387297", "0.376471", "0.378183",
  "0.379787", "0.382024", "0.387928", "0.395367", "0.391972",
  "0.381295", "0.391183", "0.383598", "0.386424", "0.384338",
  "0.401834", "0.406253", "0.392854", "0.399266", "0.400804",
  "0.391146", "0.395441", "0.396265", "0.397894", "0.384822",
  "0.385181", "0.395443", "0.400981", "0.401716", "0.406633",
  "0.406887", "0.40694", "0.391219", "0.387946", "0.398858",
  "0.402233", "0.388583", "0.389772", "0.397084", "0.711566",
  "0.954557", "0.524007", "0.672288", "0.668441", "0.421726",
  "0.549536", "0.932952", "0.397851", "0.395536", "0.354818",
  "0.374355", "0.375257", "0.362613", "0.391271", "0.379219",
  "0.363316", "0.866006", "0.862254", "0.864403", "0.861346",
  "0.845225", "0.784467", "0.801275", "0.638579", "0.847282",
  "0.847402", "0.847747", "0.790411", "0.835979", "0.838546"
]

var bins = [];
var binCount = 0;
var interval = .05;
var numOfBuckets = 1;

//Setup Bins
for(var i = 0; i < numOfBuckets; i += interval){
  bins.push({
    binNum: binCount,
    minNum: i,
    maxNum: i + interval,
    count: 0
  })
  binCount++;
}

//Loop through data and add to bin's count
for (var i = 0; i < arr.length; i++){
  var item = arr[i];
  for (var j = 0; j < bins.length; j++){
    var bin = bins[j];
    if(item > bin.minNum && item <= bin.maxNum){
      bin.count++;
    }
  }  
}

https://jsbin.com/keropoyadu/edit?js,output