reduce-object

Reduces an object to a value that is the accumulated result of running each property in the object through a callback. Executes the callback function once for each own enumerable property in the object, receiving four arguments: the initial value (or valu

filter-array

Iterates over the elements in an array, returning an array with only the elements for which the callback returns truthy.

async-each

No-bullshit, ultra-simple, 35-lines-of-code async parallel forEach / map function for JavaScript.