flat
Take a nested Javascript object and flatten it, or unflatten an object with delimited keys
for-in
Iterate over the own and inherited enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning `false`. JavaScript/Node.js
for-own
Iterate over the own enumerable properties of an object, and return an object with properties that evaluate to true from the callback. Exit early by returning `false`. JavaScript/Node.js.
object.pick
Returns a filtered copy of an object with only the specified keys, similar to `_.pick` from lodash / underscore.
flattie
A tiny (203B) and fast utility to flatten an object with customizable glue
