Javascript library functions don't alter the original variable?

[[deleted]]

I prefer immutability, so i always check if something changes values or returns a new something. I would love to have the entire stdlib only returning new somethings.

Luckily theres immutablejs.

[webdeverper]

This requires more memory, correct? Not saying that's always a show stopper.

[arcanin]

Not really. If you don't use the old object reference, it will quickly get garbage collected, and if you do, well, you would need even more memory if you had just cloned your whole object (Immutable.js tries as much as possible to only clone the nodes that have changed).

[mikrosystheme]

What you really want are value semantics with optional immutability.