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Using std::println in Rust

Rust's std::println is similar to loggers in other languages.

fn main() {
    println!("Hello, world!"); // Hello, world!
}

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Declaring Mutable & Immutable Variables in Rust

We can declare mutable and immutable variables in Rust like so:

let foo = 0; // immutable
let mut bar = 1; // mutable

Note that immutability is the default. To make a variable mutable, we need to use the mut prefix.

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Calling Static Methods in Rust

You can call a non-instance static method in Rust by using the :: separator.

Example:

impl Solution {
    pub fn return_empty_string() -> String {
 // returns ""

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Running a Rust File From the Command Line

To run a Rust file, say main.rs, you first need to compile it with rustc, which will produce an executable. Then you can run the executable.

rustc main.rs
./main

If a project is Cargo-ized, then you can use Cargo to compile it.

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Checking the Currently Installed Version of Rust

To check the version of the rustc compiler:

rustc --version

To check the version of rustup:

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MySQL's Not Equal Operators

In MySQL (and MSSQL), there are two not equal operators: != and <>.

The following SQL schema will produce the table below.

Create table If Not Exists Employees (employee_id int, name varchar(30), salary int);
Truncate table Employees;
insert into Employees (employee_id, name, salary) values ('2', 'Meir', '3000');

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Using the Main Function in Rust

Some code from Steve Donogan's "Object Orientation in Rust" was used for this gist.

In Rust, the main() function will automatically be run.

fn main() {
    println!("Hello, world!");
}

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Using the Left Function in MySQL

The following SQL schema will produce the table below.

Create table If Not Exists Employees (employee_id int, name varchar(30), salary int);
Truncate table Employees;
insert into Employees (employee_id, name, salary) values ('2', 'Meir', '3000');
insert into Employees (employee_id, name, salary) values ('3', 'Michael', '3800');
insert into Employees (employee_id, name, salary) values ('7', 'Addilyn', '7400');

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Conditional Statements in MySQL

The following SQL schema will produce the table below.

Create table If Not Exists Employees (employee_id int, name varchar(30), salary int);
Truncate table Employees;
insert into Employees (employee_id, name, salary) values ('2', 'Meir', '3000');
insert into Employees (employee_id, name, salary) values ('3', 'Michael', '3800');
insert into Employees (employee_id, name, salary) values ('7', 'Addilyn', '7400');

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Common Analytics KPIs

Name	Description
Dwell Time	The total time that an issue has been present until it is fixed.
Mean Time Between Failures (MTBF)	Average amount of time that elapses between failures.
Mean Time to Detect (MTTD)	Average amount of time it takes to discover an issue.
Mean Time to Failure (MTTF)	Average amount of time it takes for a system to fail while the issue is present.
Mean Time to Respond (MTTR)	Average amount of time it takes to fix an issue once it's found.