Lo-Dash Essentials

Searching for data

Applications don't use entire collections. Rather, they iterate over a collection subset, or they look for a specific item in the collection. Lo-Dash has a number of functional tools to help the programmer find the data they need.

Filtering collections

The simplest way to perform a filter operation on a collection using Lo-Dash is to use the where() function. This function takes an object argument and will match its properties against each item in the collection, as shown in the following code:

var collection = [ { name: 'Moe', age: 47, gender: 'm' }, { name: 'Sarah', age: 32, gender: 'f' }, { name: 'Melissa', age: 32, gender: 'f' }, { name: 'Dave', age: 32, gender: 'm' } ]; _.where(collection, { age: 32, gender: 'f' }); // → // ...