In Elixir, a variable identifier is mutable, but the value it holds is immutable.
In JavaScript, const makes a variable identifier immutable, but its value is still mutable.
const foo = {};
foo = { reassign: 'me' }; // fails
foo.mutate = 'me'; // succeeds
In computer science, variable refers to its value (see Wikipedia). Therefore, Elixir variables are immutable.
Hope you like my fancy explanation!
