Lifetimes are perhaps the hardest thing to understand when first approaching Rust. Today I’m going to create a lifetime error and demonstrate two strategies for fixing it. If you’re very new to rust, you may wish also to read the (beautifully titled) post Rust Lifetimes for the Unitialised first, as well as Strategies for Returning References in Rust.
To get started, we’re going to consider two Ruby implementations that are equivalent:
| # first version | |
| my_collection = SomeCollection.new | |
| (1..10).each do |item| | |
| value = "value number #{item + 1}" | |
| my_collection.insert(value) | |
| end | |
| # second version | |
| my_collection = SomeCollection.new | |
| values = [] | |
| (1..10).each do |item| | |
| value = "value number #{item + 1}" | |
| values.push(value) | |
| end | |
| values.each { |v| my_collection.insert(v) } |
