Deepsum.js

deepSum.js

Handlebars.registerHelper('deepSum', function(source, key) {
  var result;

  if (typeof key === 'string') {
    if (key.split('.').length > 1) {
      source = _.pluckDeep(source, key);
    } else {
      source = _.pluck(source, key);
    }
  }
  
  return result = _.reduce(source, function(memo, num) {
    return memo + num;
  });
});





// underscore.deep.js
_.mixin({
  deep: function (obj, key, value) {
    var keys = key.replace(/\[(["']?)([^\1]+?)\1?\]/g, '.$2').replace(/^\./, '').split('.'),
        root,
        i = 0,
        n = keys.length;
    if (arguments.length > 2) {
      root = obj;
      n--;

      while (i < n) {
        key = keys[i++];
        obj = obj[key] = _.isObject(obj[key]) ? obj[key] : {};
      }

      obj[keys[i]] = value;
 
      value = root;
    } else {
      while ((obj = obj[keys[i++]]) != null && i < n) {};
      value = i < n ? void 0 : obj;
    }
 
    return value;
  }
});
_.mixin({
  pluckDeep: function (obj, key) {
    return _.map(obj, function (value) { return _.deep(value, key); });
  }
});