var set = [{color:blue},{color:green},{color:red},{color:green}];
I'd like to be able to do something like a db call, set.find({color:green}) and have it return an array full of objects that contain that property.
Using Array#filter, for this particular case the code would look like
var results = set.filter(function (entry) { return entry.color === green; });
Array#filter is not implemented in some older browsers, so see the linked article for a backward compatibility shim, or better yet get a full-fledged ES5 shim.
For the more general case, it's just a matter of extending this idea:
function findByMatchingProperties(set, properties) {
return set.filter(function (entry) {
return Object.keys(properties).every(function (key) {
return entry[key] === properties[key];
});
});
}
var results = findByMatchingProperties(set, { color: green });
Again, I am using ECMAScript 5 methods Object.keys and Array#every, so use an ES5 shim. (The code is doable without an ES5 shim but uses manual loops and is much less fun to write and read.)
