Editing Summing per type

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Code snippets to compare

Test 1

Title

Async (check if this is an asynchronous test)

Code

var totalPerType = {};
for (var i = 0, len = bigData.length; i < len; ++i) {
  totalPerType[bigData[i].type] = totalPerType[bigData[i].type] || 0;
  totalPerType[bigData[i].type] += bigData[i].val;
}
var out = _.map(totalPerType, function(sum, type) {
  return {
    'type': type,
    'total': sum
  };
});

Test 2

Title

Async (check if this is an asynchronous test)

Code

var out = [];
for (var i = 0, len = bigData.length; i < len; ++i) {
  var totalObj = _.find(out, function(x) {
    return x.type == bigData[i].type;
  });
  if (!totalObj) out.push({
    'type': bigData[i].type,
    'total': bigData[i].val
  });
  else totalObj.total += bigData[i].val;
}

Test 3

Title

Async (check if this is an asynchronous test)

Code

var summed_by_type = _(bigData).reduce(function(mem, d) {
  mem[d.type] = (mem[d.type] || 0) + d.val
  return mem
}, {});

out = _(summed_by_type).map(function(v, k) {
  return {
    type: k,
    total: v
  }
});

Test 4

Title

Async (check if this is an asynchronous test)

Code

var groups = _(bigData).groupBy('type');

var out = _(groups).map(function(g, key) {
  return { 
     type: key, 
     val: _(g).reduce(function(m,x) { return m + x.val; }, 0) 
  };
});

Test 5

Title

Async (check if this is an asynchronous test)

Code

var totalPerType = {};
for (var i = 0, len = bigData.length; i < len; ++i) {
  totalPerType[bigData[i].type] += (totalPerType[bigData[i].type] || 0) + bigData[i].val;
}
var out = _.map(totalPerType, function(sum, type) {
  return {
    'type': type,
    'total': sum
  };
});