Code reviewHardcr-g165

Subject OwnershipLevel Senior–Staff~30 minCommon in Code quality & review interviewsIndustries Software development

Question

Review this Rust code that mutates a shared list via RefCell.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix — specific and kind.

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Talk through your review

Code to reviewrust

1use std::cell::RefCell;2use std::rc::Rc;3 4fn run() {5    let list = Rc::new(RefCell::new(vec![1, 2, 3]));6    let b = list.borrow();7    let first = b[0];8    list.borrow_mut().push(first + 10);9    println!("{:?}", list.borrow());10}

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