Filtering object properties based on value

Question

Is there some elegant way of filtering out falsey properties from this object with lodash/underscore? Similar to how _.compact(array) removes falsey elements fr

Answer 1

If you're using lodash, I'd recommend something like this:

var object = {
    propA: true,
    propB: true,
    propC: false,
    propD: true,
};

_.pick(object, _.identity);
// →
// {
//   propA: true,
//   propB: true,
//   propD: true
// }

The pick() function generates a new object that includes properties that the callback returns truthy for. So we can just use the identity() function as the callback, since it'll just return each property value.