To describe a group of various kind of data. Defining & Instantiating enum Event { Created, Updated, Deleted, Ping, } fn main() { let created_ev = Event::Created; } Enum Type Variants enum Event { Created { title: String, content: String }, // struct variant Updated, Deleted(String), // Tuple Variant Ping, // Unit struct } fn main()…

Defining Struct struct Car { name: String, door_count: u64 } Instantiating Struct let car1 = Car{ name: String::from("car1"), door_count: 4 }; // whole struct to mut, cannot mut only parts of the fields let mut car2 = Car{ name: String::from("car2"), door_count: 2 }; Accessing Struct’s Field println!("{}", car1.name) Struct Update Syntax let car1 = Car{ name: String::from("car1"), door_count: 4 };

Slice is a view to a continuous sequence of data in Rust. A good pre-read: Rust: References Notation let s = String::from("abcdefg"); // grab all data let slice1 = &s[..]; println!("{}", slice1); // "abcdefg" // beginning to an exclusive end index let slice2 = &s[..2]; // between inclusive start index to…

(2020–06–11) Rust concepts of references is quite unique compare to other languages nowadays. To understand it’s references we need to be aware of Rust’s concept of ownership, and references is a not-ownership component that make the whole Rust ownership concept workable Use Case Protection from Race Condition Protection from Dangling…

For a single function or method, many times we want to have various test cases where a slice of test cases could not sufficiently present it well. The alternative is to get natural IDE minimizer and grouping via immediate func call. func TestCoolFunc(t *testing.T) { func(){ // Successful Call…

The implicitness of Golang interface + the fact that function is a type, play us big favour in simplifying the writing of reusable Mocks. Given that we have a StudentService to test, and that service depends on Repository interface as follows: type StudentRepository interface { GetByID(id string) (Student, error)…

There are stories out there where some executive correctly promote a person with no prior experience to head a department, and that person strived and succeed. One of the success story is Debi Coleman appointment to chief of manufacturing by Steve Jobs though she had no prior experience yet. …

Different language has different way to best express oneself onto it, I guess this is what is called as Idiom. It struck me that I start to think that expressing a set of values in TypeScript with literal strings is the better method…. Expressing the value as literal STRINGs …

It picked my curiosity when I heard about building a production grade web application without any Server script at all ! Specifically I heard this approach being implemented with Google Firestore, and using it I am deep diving into how it being done. Why is this interesting ? “Production grade” and “Web application”, these are…