How to filter keys of an object with lodash?

Question

I have an object with some keys, and I want to only keep some of the keys with their value?

I tried with filter:

Answer 1

Lodash has a _.pickBy function which does exactly what you're looking for.

var thing = {
  "a": 123,
  "b": 456,
  "abc": 6789
};

var result = _.pickBy(thing, function(value, key) {
  return _.startsWith(key, "a");
});

console.log(result.abc) // 6789
console.log(result.b)   // undefined