I have an object with some keys, and I want to only keep some of the keys with their value?
I tried with filter:
const data = {
aaa: 111,
abb: 222,
bbb: 333
};
const result = _.filter(data, (value, key) => key.startsWith("a"));
console.log(result);<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>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?
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>Here is an example using lodash 4.x:
const data = {
aaa: 111,
abb: 222,
bbb: 333
};
const result = _.pickBy(data, (value, key) => key.startsWith("a"));
console.log(result);
// Object { aaa: 111, abb: 222 }<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>
<strong>Open your javascript console to see the output.</strong>