Immutable.js

Immutable persistent data collections for javascript

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I LOVE the logo scroll animation on mobile. Awesome.
"Immutable provides List, Stack, Map, OrderedMap, and Set by using persistent hash maps tries and vector tries as popularized by Clojure and Scala. They achieve efficiency on modern JavaScript VMs by using structural sharing and minimizing the need to copy or cache data. Immutable also provides a lazy Seq, allowing efficient chaining of collection methods like map and filter without creating intermediate representations. Create some Seq with Range and Repeat."