bucket.reasonable.js

var readline = require('readline');

function myAssigner(item) {
  return (item >= 100)? 10: item % 10;
}

function BucketReport(count,assigner,scorer) {
  return {
    buckets: new Array(count).fill(0),
    add: function(i) {
      var b = assigner(i);
      this.buckets[b] = scorer(this.buckets[b],i);
    }
  }
}

var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

var h = BucketReport(11,myAssigner,function(x,y) { return x + y });
rl.on('line', function(line){
  h.add(parseInt(line.trim()));
})
rl.on('close',function() {
  console.log(JSON.stringify(h.buckets));
});