I really like Lodash. Granted, there might be some who would prefer to write the necessary code from scratch, and this certainly is a good option for learning, but my feeling is that Lodash is a tool and if it is available and the context is right, you should at least try it out.

Here are a few functions I found useful this week:

• _.debounce
• _.unionBy
• _.differenceBy
• _.flatten

See here for a few more.