How to use _.where method from underscore.js library for more elaborated searchs

Question

var a = {
    \"title\": \"Test 1\",
    \"likes\": {
        \"id\": 1
    }
}

var b = {
    \"title\": \"Test 2\",
    \"likes\": {
        \"id\": 2
    }
}


va         


        

Answer 1

_.filter is the right way to do this, _.where is just a _.filter shortcut for filtering on simple key/value pairs. You can see this from the source:

// Convenience version of a common use case of `filter`: selecting only objects
// containing specific `key:value` pairs.
_.where = function(obj, attrs, first) {
  if (_.isEmpty(attrs)) return first ? void 0 : [];
  return _[first ? 'find' : 'filter'](obj, function(value) {
    for (var key in attrs) {
      if (attrs[key] !== value[key]) return false;
    }
    return true;
  });
};

The docs could be a little more explicit but at least the comment in the source is clear.