(twitter.com)

498 points azhenley | 1 comments | 31 Oct 25 02:34 UTC | HN request time: 0.401s | source

Show context

gethly ◴[31 Oct 25 08:53 UTC] No.45769775[source]▶

Variable is by definition mutable.

Constant is by definition immutable.

Why can't people get it through their heads in 2025? (I'm looking at you, Rust)

witx ◴[31 Oct 25 10:15 UTC] No.45770314[source]▶

A constant is a variable that _always_ has the same value on all lifecycles, e.g.

    const int a{10};

An immutable variable well ... does not

   void some_function(const int a);

Can you tell me what is the value of `a` on both cases?

1. pasteldream ◴[31 Oct 25 19:20 UTC] No.45775686[source]▶

I’m not sure why witx’s comment was downvoted. This is absolutely the standard usage in math and computer science.

John Carmack on mutable variables