Useful Links

Slides: https://beyondcodebootcamp.github.io/

Video: https://youtu.be/ID_GOES_HERE

AJ ONeal
@_beyondcode
youtube.com/coolaj86

Dangerous Wrong Thinker

Equal Opportunity Offender

Technophobic Technologist Extraordinairé

Utah Node.js

Utah Rust

Twitch.tv/coolaj86

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(if this is useful, or entertaining)

Shadowing

When you want to reuse

When you want to reuse

the name of a variable.

let answer = "42";
let answer = answer.parse::<i32>().unwrap();

Scenario

All command line args are strings.

(even when they’re numbers)

let ageStr = env::args().skip(1).next()
  .unwrap();
println!("age: {}", age);
 
let ageNum = ageStr.parse::<i32>()
  .unwrap();
println!("age: {}", age);

let ageStr = env::args().skip(1).next()
  .unwrap();
println!("age: {}", age);
 
let ageNum = ageStr.parse::<i32>()
  .unwrap();
println!("age: {}", age);

let ageStr = env::args().skip(1).next()
  .unwrap();
println!("age: {}", age);
 
let ageNum = ageStr.parse::<i32>()
  .unwrap();
println!("age: {}", age);

But

storing type information

in a name

… is lame.

// type of 'age' is string
let age = env::args().skip(1).next()
  .unwrap();
println!("age: {}", age);
 
// different memory location for new 'age', as int!
// (the other age may still be useful through other references)
let age = age.parse::<i32>()
  .unwrap();
println!("age: {}", age);

// type of 'age' is string
let age = env::args().skip(1).next()
  .unwrap();
println!("age: {}", age);
 
// different memory location for new 'age', as int!
// (the other age may still be useful through other references)
let age = age.parse::<i32>()
  .unwrap();
println!("age: {}", age);

// type of 'age' is string
let age = env::args().skip(1).next()
  .unwrap();
println!("age: {}", age);
 
// different memory location for new 'age', as int!
// (the other age may still be useful through other references)
let age = age.parse::<i32>()
  .unwrap();
println!("age: {}", age);

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Thanks.

FIN