I haven't done so previously, but I make extensive use of: •

Array.filter

,

Array.map

, and

Array.reduce

for array manipulation: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array •

lodash.js

for a whole host of great utility methods: https://lodash.com/ •

moment.js

for all things Date/Time related: https://momentjs.com/