list
List factory - work in progress
Don't use list when your data is already in arrays - use list when you're
dealing with iterables/generators and want array-like comprehensions like
filter, map, forEach, find, some etc.
You can also use it as an immutable collection if that's your thing, all functions return a new list rather than mutate an existing one.
list is not super performant inside hot code - V8 does not optimize generator
functions - use arrays if you need very high performance - code is somewhat
optimised but still slow compared to arrays. Further optimization is likely
possible, PRs welcome.
Install
npm install @mojule/list
Example
Notes (work in progress)
Creates "lists" from any underlying iterable
Live, if the underlying data source changes, so do any derived lists:
const arr = [ 1, 2, 3 ]
const list = List( arr )
const filtered = list.filter( n => n % 2 === 0 )
console.log( Array.from( filtered ) ) // [ 2 ]
arr.push( 4 )
console.log( Array.from( filtered ) ) // [ 2, 4 ]Can also be used to create new immutable lists:
const list1 = List( 1, 2, 3 )
const list2 = List( 4, 5, 6 )
const list3 = list1.concat( list2 )