Top "Immutability" questions

Does "<-" mean assigning a variable in Haskell?

Just started Haskell, it's said that everything in Haskell is "immutable" except IO package. So when I bind a name …

variables haskell immutability assign

How to convert immutable Seq to mutable seq with until loop

I'm trying to return a mutable Sequence with an until loop, but i have an immutable seq in return of (0 …

scala sequence immutability mutable

Redux Reducer - How to update an object value without mutating the state?

My reducer looks like this: const players = (state = {}, action) => { switch (action.type) { case 'UPDATE_PLAYERS_CARDS': return Object.assign({}, …

javascript reactjs redux immutability reducers

Why does Scala's toSeq convert an immutable Set to a mutable ArrayBuffer?

If I call toSeq on an immutable Set collection I get an ArrayBuffer. scala> Set(1,2,3).toSeq // returns Seq[Int] = …

scala set sequence immutability scala-collections

cannot borrow `self.x` as immutable because `*self` is also borrowed as mutable

First, let the code speak: #[derive(Debug)] struct Bar; #[derive(Debug)] struct Qux { baz: bool } #[derive(Debug)] struct Foo { bars: …

rust immutability mutability