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[[Rust]]
[[To put data on the heap use a Box]]
---
Each function has a frame consisting of variables. Those frames live on the stack.
A frame is **deallocated when the function returns**.
If we assign a variable such as
```rust
let a = [0; 1_000_000];
let b = a;
```
the value of a is **copied** to b (thus we get two huge arrays). This is **expensive**. Think about what happens when we call a function.
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