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CompareTest.html
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<!DOCTYPE html>
<html>
<!--
SiteMap.html
Links to most pages in this site and many external sites
-->
<head>
<title>CompareTest</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link rel="stylesheet" href="css/StylesPageFrameDefaults.css" />
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<body id="github" onload="initialize()">
<a id="Next" href="CompareTest.html">Next</a>
<a id="Prev" href="CompareTest.html">Prev</a>
<page-frame>
<frame-header>
<nav id="navbar"></nav>
</frame-header>
<main>
<div id="about">about</div>
<div id="page">CompareTest</div>
<div id="modified">9/03/2022</div>
<div id="hlp"></div>
<a id="top"></a>
<content>
<header>
<hgroup id="pagetitle">
<h1 id="title">Compare Test</h1>
<h3 style="font-weight:normal;" class="indent">organized bits of syntax, idoms, and patterns</h3>
</hgroup>
<div class="quickStatusContainer">
<details>
<summary class="darkItem quickStatus">Quick Status</summary>
<status-grid class="lightItem border">
<status-itemLeft style="height:0.1em; border:none;"></status-itemLeft>
<status-itemRight style="height:0.1em;"></status-itemRight>
<status-itemLeft>
<span class="notice">Recent page additions</span>
</status-itemLeft>
<status-itemRight>
</status-itemRight>
<status-itemLeft>
getting started
</status-itemLeft>
<status-itemRight style="border-bottom:1px solid darkred;">
testing UI format for code comparison
</status-itemRight>
<status-itemLeft style="height:0.5em; border:none;"></status-itemLeft>
<status-itemRight style="height:0.5em; border:none;"></status-itemRight>
</status-grid>
</details>
</div>
</header>
<!--<div style="padding-left:25px;">
"Do the best you can until you know better. Then when you know better, do better"
<br />
- Maya Angelou
</div>
<hr class="spread" />-->
<div style="height:0.0em;"></div>
<!--</help-display>-->
<a id="stories"></a>
<help-display>
<help-block class="lefts">
<table>
<tr>
<th style="font-size:large;" colspan="3">
Rust code bits
</th>
</tr>
<tr>
<th>What is this?</th><th>Code demo</th><th>Commentary</th>
</tr>
<tr>
<td id="hello">
Hello World
<hr />
The traditional first look at a new language
</td>
<td style="vertical-align:top;">
<defn-code class="lightRust" style="font-size:small;">
// HelloWorld::main.rs
fn main() {
println!("Hello, world!");
}
</defn-code>
</td>
<td>
In Rust, functions begin with the fn declarator, accept arguments in a parentisized list, encapsulate
an executable code in a set of statements enclosed in braces, and may declare a return type.
<defn-code class="lightRust" style="font-size:small;">
fn g(ArgType a) { ... } -> ReturnType
</defn-code>
If functions end with an expression, the
value is returned; no return statement necessary. Those that end with statements, e.g., end with a semicolon, return the
unit (), signifying nothing.
<div style="height:0.75em;"></div>
Each executable Rust program starts in a "main" function, which often calls other functions
supplying operational details. There can be only one main in an executable.
<div style="height: 1em;"></div>
</td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ Hello World</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=1356486106090095ee3a23dd8445043d">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="#objects">C# Hello World →</a>
</div>
</th>
</tr>
<tr>
<td id="objects">
Hello Objects
<hr />
Demonstrates how Types are defined and instances created. The type DemoObj is defined above its main function
and instances dob and cdob are created in main.
</td>
<td style="vertical-align:top;">
<defn-code class="lightRust" style="font-size:small;">
// CreateObject::main.rs
/*-------------------------------------
- Declare DemoObj struct, like C++ class
- Rqst compiler impl traits Debug & Clone
*/
#[derive(Debug, Clone)]
pub struct DemoObj {
name : String
}
/*-- implement functions new and name --*/
impl DemoObj {
pub fn new(obj_name: &str)
-> DemoObj {
DemoObj {
name: obj_name.to_string()
}
}
pub fn name(&self) -> &str {
&self.name
}
}
/*-- Demo DemoObj instance in action --*/
fn main() {
print!(
"\n -- demonstrate object creation --\n"
);
let dob = DemoObj::new("Frank");
print!(
"\n DemoObj instance name is {:?}",
dob.name()
);
let cdob = dob.clone();
print!(
"\n name of clone is {:?}", cdob.name()
);
print!("\n\n That's all Folks!\n\n");
}
</defn-code>
</td>
<td>
Types are defined with structs, like DemoObj on the left. Functionality is provided through methods,
e.g., functions associated with the struct. All methods are declared and defined in impl { ... } blocks.
<div style="height:0.75em;"></div>
The function DemoObj::new(&str) is a static method that creates an instance of DemoObj and endows it with a name.
Function name(&self) is a none-static method that accepts a reference to its instance and returns its name.
<div style="height:0.75em;"></div>
Static functions do not take a reference to self and so cannot access member data. They act like ordinary functions
but are accessed with their type followed by colons followed by the function. Non-static functions take a reference
to self, can access member data, and are accessed from an object name followed by a period.
<div style="height:0.75em;"></div>
Types and functions declare public accessibility with the pub keyword. Functions declare return types with
the -> SomeType syntax following the parameter list.
<div style="height:0.75em;"></div>
Macro names end with ! like the print!("..."); statement.
<div style="height:0.75em;"></div>
The code at the left declares the type and operations for DemoObj.
<defn-code class="lightRust" style="font-size:small;">
C:\...\CreateObject\RustObject>
cargo run -q
-- demonstrate object creation --
DemoObj instance name is "Frank"
name of clone is "Frank"
That's all Folks!
</defn-code>
</td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ Hello Objects</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=a061d5c7acf03c4c91240516cd35d898">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="index.html">C# Hello Objects →</a>
</div>
</th>
</tr>
<tr>
<td id="data">Hello Data</td>
<td></td>
<td></td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ Hello Data</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="#">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="index.html">C# Hello Data →</a>
</div>
</th>
</tr>
<tr>
<td id="iter">Iteration</td><td></td><td></td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ iteration</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="javascript:;">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="index.html">C# iteration →</a>
</div>
</th>
</tr>
<tr>
<td id="datastr">Data Structures</td><td></td><td></td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ Data Structures</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="#">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="index.html">C# Data Structures →</a>
</div>
</th>
</tr>
<tr>
<td id="funcs">Functions</td><td></td><td></td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ functions</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="#">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="index.html">C# functions →</a>
</div>
</th>
</tr>
<tr id="genfuncs">
<td>Generic functions</td><td></td><td></td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ generic functions</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="#">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="index.html">C# generic functions →</a>
</div>
</th>
</tr>
<tr>
<td id="structs">Structs</td><td></td><td></td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ classes</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="#">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
<a class="bottomlink" href="index.html">C# classes →</a>
</div>
</th>
</tr>
<tr>
<td id="genstructs">Generic structs</td><td></td><td></td>
</tr>
<tr>
<th>
<div class="bottombutton left lightRust">
<a class="bottomlink" href="index.html">← C++ template classes</a>
</div>
</th>
<th>
<div class="bottombutton center lightRust">
<a class="bottomlink" href="#">Execute code in Rust Playground</a>
</div>
</th>
<th>
<div class="bottombutton right lightRust">
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