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@ -30,14 +30,10 @@ Let's start somewhere simple: functions.
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Functions are defined using `fn` instead of `func`:
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```go
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// go
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func foo() {}
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```
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```rust
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// rust
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fn foo() {}
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```
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@ -46,14 +42,10 @@ fn foo() {}
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Arguments can be passed by separating the name from the type with a colon:
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```go
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// go
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func foo(bar int) {}
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```
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```rust
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// rust
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fn foo(bar: i32) {}
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```
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@ -62,16 +54,12 @@ fn foo(bar: i32) {}
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Values can be returned by adding `-> Type` to the function declaration:
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```go
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// go
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func foo() int {
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return 2
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}
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```
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```rust
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// rust
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fn foo() -> i32 {
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return 2;
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}
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@ -81,8 +69,6 @@ In Rust values can also be returned on the last statement without the `return`
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keyword or a terminating semicolon:
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```rust
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// rust
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fn foo() -> i32 {
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2
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}
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@ -92,8 +78,6 @@ fn foo() -> i32 {
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work?](conversation://Mara/hmm)
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```rust
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// rust
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fn foo() -> i32 {
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if some_cond {
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2
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@ -122,8 +106,6 @@ This happens because most basic statements in Rust can return values. The best
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way to fix this would be to move the `4` return into an `else` block:
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```rust
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// rust
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fn foo() -> i32 {
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if some_cond {
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2
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@ -137,8 +119,6 @@ Otherwise, the compiler will think you are trying to use that `if` as a
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statement, such as like this:
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```rust
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// rust
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let val = if some_cond { 2 } else { 4 };
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```
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@ -153,8 +133,6 @@ with any error. For readability, this post will use the eyre Result type.
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the Result type to work across any type you could imagine.](conversation://Mara/hacker)
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```go
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// go
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import "errors"
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func divide(x, y int) (int, err) {
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@ -167,8 +145,6 @@ func divide(x, y int) (int, err) {
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```
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```rust
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// rust
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use eyre::{eyre, Result};
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fn divide(x: i32, y: i32) -> Result<i32> {
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@ -191,8 +167,6 @@ transient error type on the fly.
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First we need to make our own simple error type for a DivideByZero error:
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```rust
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// rust
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use std::error::Error;
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use std::fmt;
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@ -211,8 +185,6 @@ impl Error for DivideByZero {}
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So now let's use it:
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```rust
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// rust
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fn divide(x: i32, y: i32) -> Result<i32, DivideByZero> {
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match y {
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0 => Err(DivideByZero{}),
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@ -227,8 +199,6 @@ Go](https://godoc.org/builtin#error). In order to represent that we need to
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return something that implements the Error trait:
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```rust
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// rust
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fn divide(x: i32, y: i32) -> Result<i32, impl Error> {
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// ...
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}
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@ -263,8 +233,6 @@ making a pointer to a value or possibly putting a value in an `interface{}`
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(which can be annoying to deal with in practice).](conversation://Mara/hacker)
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```go
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// go
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func doThing() (int, error) {
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result, err := divide(3, 4)
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if err != nil {
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@ -276,8 +244,6 @@ func doThing() (int, error) {
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```
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```rust
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// rust
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use eyre::Result;
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fn do_thing() -> Result<i32> {
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@ -300,8 +266,6 @@ represent anything that implements the Error trait.
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Rust macros are function calls with `!` after their name:
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```rust
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// rust
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println!("hello, world");
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```
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@ -310,16 +274,12 @@ println!("hello, world");
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Variables are created using `let`:
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```go
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// go
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var foo int
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var foo = 3
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foo := 3
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```
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```rust
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// rust
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let foo: i32;
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let foo = 3;
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```
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@ -330,8 +290,6 @@ In Rust, every variable is immutable (unchangeable) by default. If we try to
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change those variables above we get a compiler error:
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```rust
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// rust
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fn main() {
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let foo: i32;
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let foo = 3;
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@ -358,8 +316,6 @@ As the compiler suggests, you can create a mutable variable by adding the `mut`
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keyword after the `let` keyword. There is no analog to this in Go.
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```rust
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// rust
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let mut foo: i32 = 0;
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foo = 4;
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```
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@ -384,8 +340,6 @@ For example, this code will fail to compile because `quo` was moved into the
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second divide call:
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```rust
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// rust
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let quo = divide(4, 8)?;
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let other_quo = divide(quo, 5)?;
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@ -396,8 +350,6 @@ let yet_another_quo = divide(quo, 4)?;
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To work around this you can pass a reference to the divide function:
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```rust
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// rust
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let other_quo = divide(&quo, 5);
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let yet_another_quo = divide(&quo, 4)?;
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```
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@ -405,8 +357,6 @@ let yet_another_quo = divide(&quo, 4)?;
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Or even create a clone of it:
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```rust
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// rust
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let other_quo = divide(quo.clone(), 5);
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let yet_another_quo = divide(quo, 4)?;
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```
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@ -470,8 +420,6 @@ import "github.com/foo/bar"
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```
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```rust
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// rust
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use foo; // -> foo now has the members of crate foo behind the :: operator
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use foo::Bar; // -> Bar is now exposed as a type in this file
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@ -490,8 +438,6 @@ program uses [tokio](https://tokio.rs/) to handle async tasks. To run an async
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task and wait for its result, do this:
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```
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// rust
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let printer_fact = reqwest::get("https://printerfacts.cetacean.club/fact")
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.await?
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.text()
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@ -505,8 +451,6 @@ household pet, the [printer](https://printerfacts.cetacean.club).
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To make an async function, add the `async` keyword before the `fn` keyword:
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```rust
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// rust
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async fn get_text(url: String) -> Result<String> {
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reqwest::get(&url)
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.await?
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@ -518,8 +462,6 @@ async fn get_text(url: String) -> Result<String> {
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This can then be called like this:
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```rust
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// rust
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let printer_fact = get_text("https://printerfacts.cetacean.club/fact").await?;
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```
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@ -544,16 +486,12 @@ for more information.](conversation://Mara/hacker)
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Rust structures are created using the `struct` keyword:
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```go
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// go
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type Client struct {
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Token string
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}
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```
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```rust
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// rust
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pub struct Client {
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pub token: String,
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}
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@ -120,4 +120,5 @@
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@}
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</script>
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<script src="https://cdn.christine.website/file/christine-static/prism/prism.js"></script>
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@:footer_html()
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@ -14,6 +14,7 @@
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<link rel="stylesheet" href="/css/hack.css" />
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<link rel="stylesheet" href="/css/gruvbox-dark.css" />
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<link rel="stylesheet" href="/css/shim.css" />
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<link rel="stylesheet" href="https://cdn.christine.website/file/christine-static/prism/prism.css" />
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@if Utc::now().month() == 12 { <link rel="stylesheet" href="/css/snow.css" /> }
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<link rel="manifest" href="/static/manifest.json" />
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