How to filter keys of an object with lodash?

javascript filter lodash
Freewind picture Freewind · Jun 9, 2015 · Viewed 183k times · Source

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

I tried with filter:

But it prints an array:

[111, 222]

Which is not what I want.

How to do it with lodash? Or something else if lodash is not working?

Answer

serg10 picture serg10 · Jun 9, 2015

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
<script src="https://cdn.jsdelivr.net/lodash/4.16.4/lodash.min.js"></script>

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