Advertisements Here is my code, it can compile trait AppendBar { fn append_bar(self) -> Self; } impl AppendBar for Vec<String> { fn append_bar(mut self) -> Self { self.push("Bar".to_string()); self } although it takes the ownership, but why it can mutate self in its implementation? >Solution : Because mutability of arguments is not part of the… Read More Why an implement of immutable trait can be mutable?
Advertisements I was trying to implement a Networking Module for my personal project and I was following TDD. When I am writing the test cases I came across a compile error and I was not able to map the error with Swift concepts. I could have easily ignored it and done the implementation in a… Read More Mutability of a class after conforming to protocol is in question
Advertisements I’m a newbuy in Rust. I need to store a collection of closures (fn_list) that can use variables from the context, after that I need to call these closures. Playground code: pub struct MyScope { pub fn_list: HashMap<String, Box<dyn FnMut(String)>>, } fn main() { let hello = "Hello"; let closure = move |name: String|{… Read More How to call FnMut stored in the collection? (error: cannot borrow `*handler` as mutable, as it is behind a `&` reference)
Advertisements I want to have multiple data containers for the same object with the same reference (pointer), and can’t figure out how to achieve that in Rust. Go can simply use reference to the object as below: type container struct { id int status string } m1 := make(map[int]*container) m2 := make(map[int]*container) c := &container{id:… Read More Shared object reference between different Rust containers without copy
Advertisements I am trying to add a new property to an object which is part of an array of objects. The main array looks like this: 0: {key: ‘Fruits’, props: Array(22)} 1: {key: ‘Dried’, props: Array(1)} 2: {key: ‘Fresh’, props: Array(1)} 3: {key: ‘Exotic’, props: Array(6)} 4: {key: ‘Nuts’, props: Array(6)} What I want to… Read More Add a new property to an object from an array of objects in Javascript
Advertisements So basically I have two lists a and b and have defined them like a=b=[10] so changing one will change the other- a=b=[10] a[0]+=1 a >>>[11] b >>>[11] Is there a way to do this but instead make it give double of the variable? Desired output – a=b=[10] #some code a >>>[10] b >>>[20]… Read More Can I link two variables such that one is double of another in python?