An iteratee is basically a function. When you call lodash’s iteratee function it returns a function that can be used later in the code. There are 3 different type of iteratee which I’ll describe in turn, using the following objects in the example code. let mary = { name: ‘mary’, gender: ‘female’, age: 25, job: … Read more
Lodash allows you to filter in nested data (including arrays) like this: _.filter(modules, { submodules: [ { id: 2 } ]});
It seems that you are ordering by the wrong property value. _.orderBy(list, item => item.age.milliseconds, [‘desc’]);
Solution You can use countBy: const total = _.countBy( array, ({ a }) => a < 4 ? ‘lessThanFour’ : ‘greaterThanFour’ ).lessThanFour Alternative Using sumBy: const total = _.sumBy( array, ({ a }) => Number(a < 4) ); And here’s the same but with lodash/fp: const count = _.sumBy(_.flow(_.get(‘a’), _.lt(4), Number), objects);
You can use _.compact(array); Creates an array with all falsey values removed. The values false, null, 0, “”, undefined, and NaN are falsey. See: https://lodash.com/docs/4.15.0#compact