From 809271493c135763bcf513906dbe90955394d625 Mon Sep 17 00:00:00 2001
From: Vasu Sharma <vasu.sharma@blue-yonder.com>
Date: Tue, 8 Dec 2020 10:35:52 +0100
Subject: [PATCH] Solutions: Part 1
---
exercises/functions/functions1.rs | 4 ++--
exercises/functions/functions2.rs | 4 +---
exercises/functions/functions3.rs | 4 +---
exercises/functions/functions4.rs | 4 +---
exercises/functions/functions5.rs | 4 +---
exercises/if/if1.rs | 3 +--
exercises/if/if2.rs | 6 ++---
exercises/primitive_types/primitive_types1.rs | 4 +---
exercises/primitive_types/primitive_types2.rs | 4 +---
exercises/primitive_types/primitive_types3.rs | 4 +---
exercises/primitive_types/primitive_types4.rs | 4 +---
exercises/primitive_types/primitive_types5.rs | 4 +---
exercises/primitive_types/primitive_types6.rs | 4 +---
exercises/quiz1.rs | 12 +++++++---
exercises/quiz2.rs | 23 +++++++++----------
exercises/strings/strings1.rs | 4 +---
exercises/strings/strings2.rs | 4 +---
exercises/structs/structs1.rs | 16 +++++++------
exercises/structs/structs2.rs | 16 ++++++++++---
exercises/structs/structs3.rs | 14 +++++------
exercises/variables/variables1.rs | 4 +---
exercises/variables/variables2.rs | 4 +---
exercises/variables/variables3.rs | 4 +---
exercises/variables/variables4.rs | 4 +---
exercises/variables/variables5.rs | 4 +---
exercises/variables/variables6.rs | 4 +---
26 files changed, 72 insertions(+), 94 deletions(-)
diff --git a/exercises/functions/functions1.rs b/exercises/functions/functions1.rs
index 3112527..5f067be 100644
--- a/exercises/functions/functions1.rs
+++ b/exercises/functions/functions1.rs
@@ -1,8 +1,8 @@
// functions1.rs
// Make me compile! Execute `rustlings hint functions1` for hints :)
-// I AM NOT DONE
-
fn main() {
call_me();
}
+
+fn call_me() {}
\ No newline at end of file
diff --git a/exercises/functions/functions2.rs b/exercises/functions/functions2.rs
index 108ba38..cfc3cc1 100644
--- a/exercises/functions/functions2.rs
+++ b/exercises/functions/functions2.rs
@@ -1,13 +1,11 @@
// functions2.rs
// Make me compile! Execute `rustlings hint functions2` for hints :)
-// I AM NOT DONE
-
fn main() {
call_me(3);
}
-fn call_me(num) {
+fn call_me(num: i32) {
for i in 0..num {
println!("Ring! Call number {}", i + 1);
}
diff --git a/exercises/functions/functions3.rs b/exercises/functions/functions3.rs
index e3c1bf7..a818d1f 100644
--- a/exercises/functions/functions3.rs
+++ b/exercises/functions/functions3.rs
@@ -1,10 +1,8 @@
// functions3.rs
// Make me compile! Execute `rustlings hint functions3` for hints :)
-// I AM NOT DONE
-
fn main() {
- call_me();
+ call_me(5);
}
fn call_me(num: i32) {
diff --git a/exercises/functions/functions4.rs b/exercises/functions/functions4.rs
index 58637e4..7d39271 100644
--- a/exercises/functions/functions4.rs
+++ b/exercises/functions/functions4.rs
@@ -4,14 +4,12 @@
// This store is having a sale where if the price is an even number, you get
// 10 Rustbucks off, but if it's an odd number, it's 3 Rustbucks off.
-// I AM NOT DONE
-
fn main() {
let original_price = 51;
println!("Your sale price is {}", sale_price(original_price));
}
-fn sale_price(price: i32) -> {
+fn sale_price(price: i32) -> i32{
if is_even(price) {
price - 10
} else {
diff --git a/exercises/functions/functions5.rs b/exercises/functions/functions5.rs
index d22aa6c..059e929 100644
--- a/exercises/functions/functions5.rs
+++ b/exercises/functions/functions5.rs
@@ -1,13 +1,11 @@
// functions5.rs
// Make me compile! Execute `rustlings hint functions5` for hints :)
-// I AM NOT DONE
-
fn main() {
let answer = square(3);
println!("The answer is {}", answer);
}
fn square(num: i32) -> i32 {
- num * num;
+ num * num
}
diff --git a/exercises/if/if1.rs b/exercises/if/if1.rs
index 9086754..261eae8 100644
--- a/exercises/if/if1.rs
+++ b/exercises/if/if1.rs
@@ -1,13 +1,12 @@
// if1.rs
-// I AM NOT DONE
-
pub fn bigger(a: i32, b: i32) -> i32 {
// Complete this function to return the bigger number!
// Do not use:
// - another function call
// - additional variables
// Execute `rustlings hint if1` for hints
+ if a >= b { a } else {b}
}
// Don't mind this for now :)
diff --git a/exercises/if/if2.rs b/exercises/if/if2.rs
index 80effbd..545083a 100644
--- a/exercises/if/if2.rs
+++ b/exercises/if/if2.rs
@@ -4,13 +4,13 @@
// Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
// Execute the command `rustlings hint if2` if you want a hint :)
-// I AM NOT DONE
-
pub fn fizz_if_foo(fizzish: &str) -> &str {
if fizzish == "fizz" {
"foo"
+ } else if fizzish == "fuzz" {
+ "bar"
} else {
- 1
+ "baz"
}
}
diff --git a/exercises/primitive_types/primitive_types1.rs b/exercises/primitive_types/primitive_types1.rs
index 0912139..18bd819 100644
--- a/exercises/primitive_types/primitive_types1.rs
+++ b/exercises/primitive_types/primitive_types1.rs
@@ -2,8 +2,6 @@
// Fill in the rest of the line that has code missing!
// No hints, there's no tricks, just get used to typing these :)
-// I AM NOT DONE
-
fn main() {
// Booleans (`bool`)
@@ -12,7 +10,7 @@ fn main() {
println!("Good morning!");
}
- let // Finish the rest of this line like the example! Or make it be false!
+ let is_evening = true; // Finish the rest of this line like the example! Or make it be false!
if is_evening {
println!("Good evening!");
}
diff --git a/exercises/primitive_types/primitive_types2.rs b/exercises/primitive_types/primitive_types2.rs
index 6576a4d..0e546f9 100644
--- a/exercises/primitive_types/primitive_types2.rs
+++ b/exercises/primitive_types/primitive_types2.rs
@@ -2,8 +2,6 @@
// Fill in the rest of the line that has code missing!
// No hints, there's no tricks, just get used to typing these :)
-// I AM NOT DONE
-
fn main() {
// Characters (`char`)
@@ -16,7 +14,7 @@ fn main() {
println!("Neither alphabetic nor numeric!");
}
- let // Finish this line like the example! What's your favorite character?
+ let your_character = 'T'; // Finish this line like the example! What's your favorite character?
// Try a letter, try a number, try a special character, try a character
// from a different language than your own, try an emoji!
if your_character.is_alphabetic() {
diff --git a/exercises/primitive_types/primitive_types3.rs b/exercises/primitive_types/primitive_types3.rs
index aaa518b..bc89dd8 100644
--- a/exercises/primitive_types/primitive_types3.rs
+++ b/exercises/primitive_types/primitive_types3.rs
@@ -2,10 +2,8 @@
// Create an array with at least 100 elements in it where the ??? is.
// Execute `rustlings hint primitive_types3` for hints!
-// I AM NOT DONE
-
fn main() {
- let a = ???
+ let a = [1, 2, 3, 4, 3, 2, 1];
if a.len() >= 100 {
println!("Wow, that's a big array!");
diff --git a/exercises/primitive_types/primitive_types4.rs b/exercises/primitive_types/primitive_types4.rs
index 10b553e..d773c13 100644
--- a/exercises/primitive_types/primitive_types4.rs
+++ b/exercises/primitive_types/primitive_types4.rs
@@ -2,13 +2,11 @@
// Get a slice out of Array a where the ??? is so that the test passes.
// Execute `rustlings hint primitive_types4` for hints!!
-// I AM NOT DONE
-
#[test]
fn slice_out_of_array() {
let a = [1, 2, 3, 4, 5];
- let nice_slice = ???
+ let nice_slice = &a[1..4];
assert_eq!([2, 3, 4], nice_slice)
}
diff --git a/exercises/primitive_types/primitive_types5.rs b/exercises/primitive_types/primitive_types5.rs
index 680d8d2..85f42cf 100644
--- a/exercises/primitive_types/primitive_types5.rs
+++ b/exercises/primitive_types/primitive_types5.rs
@@ -2,11 +2,9 @@
// Destructure the `cat` tuple so that the println will work.
// Execute `rustlings hint primitive_types5` for hints!
-// I AM NOT DONE
-
fn main() {
let cat = ("Furry McFurson", 3.5);
- let /* your pattern here */ = cat;
+ let (name, age) = cat;
println!("{} is {} years old.", name, age);
}
diff --git a/exercises/primitive_types/primitive_types6.rs b/exercises/primitive_types/primitive_types6.rs
index b8c9b82..0c877aa 100644
--- a/exercises/primitive_types/primitive_types6.rs
+++ b/exercises/primitive_types/primitive_types6.rs
@@ -3,13 +3,11 @@
// You can put the expression for the second element where ??? is so that the test passes.
// Execute `rustlings hint primitive_types6` for hints!
-// I AM NOT DONE
-
#[test]
fn indexing_tuple() {
let numbers = (1, 2, 3);
// Replace below ??? with the tuple indexing syntax.
- let second = ???;
+ let second = numbers.1;
assert_eq!(2, second,
"This is not the 2nd number in the tuple!")
diff --git a/exercises/quiz1.rs b/exercises/quiz1.rs
index 5c5c355..0de3ff2 100644
--- a/exercises/quiz1.rs
+++ b/exercises/quiz1.rs
@@ -7,10 +7,16 @@
// more than 40 at once, each apple only costs 1! Write a function that calculates
// the price of an order of apples given the order amount. No hints this time!
-// I AM NOT DONE
-
// Put your function here!
-// fn ..... {
+
+fn calculate_apple_price(quantity: i32) -> i32 {
+ if quantity <= 40 {
+ quantity * 2
+ }
+ else {
+ quantity
+ }
+}
// Don't modify this function!
#[test]
diff --git a/exercises/quiz2.rs b/exercises/quiz2.rs
index de0dce9..1399863 100644
--- a/exercises/quiz2.rs
+++ b/exercises/quiz2.rs
@@ -7,8 +7,6 @@
// you think each value is. That is, add either `string_slice` or `string`
// before the parentheses on each line. If you're right, it will compile!
-// I AM NOT DONE
-
fn string_slice(arg: &str) {
println!("{}", arg);
}
@@ -16,15 +14,16 @@ fn string(arg: String) {
println!("{}", arg);
}
+# TODO: @vasu
fn main() {
- ???("blue");
- ???("red".to_string());
- ???(String::from("hi"));
- ???("rust is fun!".to_owned());
- ???("nice weather".into());
- ???(format!("Interpolation {}", "Station"));
- ???(&String::from("abc")[0..1]);
- ???(" hello there ".trim());
- ???("Happy Monday!".to_string().replace("Mon", "Tues"));
- ???("mY sHiFt KeY iS sTiCkY".to_lowercase());
+ string_slice("blue");
+ string("red".to_string());
+ string(String::from("hi"));
+ string("rust is fun!".to_owned());
+ string_slice("nice weather".into());
+ string(format!("Interpolation {}", "Station"));
+ string_slice(&String::from("abc")[0..1]);
+ string_slice(" hello there ".trim());
+ string("Happy Monday!".to_string().replace("Mon", "Tues"));
+ string("mY sHiFt KeY iS sTiCkY".to_lowercase());
}
diff --git a/exercises/strings/strings1.rs b/exercises/strings/strings1.rs
index 8090244..e43c88a 100644
--- a/exercises/strings/strings1.rs
+++ b/exercises/strings/strings1.rs
@@ -2,13 +2,11 @@
// Make me compile without changing the function signature!
// Execute `rustlings hint strings1` for hints ;)
-// I AM NOT DONE
-
fn main() {
let answer = current_favorite_color();
println!("My current favorite color is {}", answer);
}
fn current_favorite_color() -> String {
- "blue"
+ String::from("blue")
}
diff --git a/exercises/strings/strings2.rs b/exercises/strings/strings2.rs
index 5a2ce74..a048f88 100644
--- a/exercises/strings/strings2.rs
+++ b/exercises/strings/strings2.rs
@@ -2,11 +2,9 @@
// Make me compile without changing the function signature!
// Execute `rustlings hint strings2` for hints :)
-// I AM NOT DONE
-
fn main() {
let word = String::from("green"); // Try not changing this line :)
- if is_a_color_word(word) {
+ if is_a_color_word(&word) {
println!("That is a color word I know!");
} else {
println!("That is not a color word I know.");
diff --git a/exercises/structs/structs1.rs b/exercises/structs/structs1.rs
index 6d0b2f4..b77c773 100644
--- a/exercises/structs/structs1.rs
+++ b/exercises/structs/structs1.rs
@@ -1,13 +1,12 @@
// structs1.rs
// Address all the TODOs to make the tests pass!
-// I AM NOT DONE
-
struct ColorClassicStruct {
- // TODO: Something goes here
+ name: String, // TODO: Something goes here
+ hex: String,
}
-struct ColorTupleStruct(/* TODO: Something goes here */);
+struct ColorTupleStruct(String, String);
#[derive(Debug)]
struct UnitStruct;
@@ -19,7 +18,10 @@ mod tests {
#[test]
fn classic_c_structs() {
// TODO: Instantiate a classic c struct!
- // let green =
+ let green = ColorClassicStruct {
+ name: String::from("green"),
+ hex: String::from("#00FF00")
+ };
assert_eq!(green.name, "green");
assert_eq!(green.hex, "#00FF00");
@@ -28,7 +30,7 @@ mod tests {
#[test]
fn tuple_structs() {
// TODO: Instantiate a tuple struct!
- // let green =
+ let green = ColorTupleStruct(String::from("green"), String::from("#00FF00"));
assert_eq!(green.0, "green");
assert_eq!(green.1, "#00FF00");
@@ -37,7 +39,7 @@ mod tests {
#[test]
fn unit_structs() {
// TODO: Instantiate a unit struct!
- // let unit_struct =
+ let unit_struct = UnitStruct;
let message = format!("{:?}s are fun!", unit_struct);
assert_eq!(message, "UnitStructs are fun!");
diff --git a/exercises/structs/structs2.rs b/exercises/structs/structs2.rs
index f9c6427..1c58a9d 100644
--- a/exercises/structs/structs2.rs
+++ b/exercises/structs/structs2.rs
@@ -1,8 +1,6 @@
// structs2.rs
// Address all the TODOs to make the tests pass!
-// I AM NOT DONE
-
#[derive(Debug)]
struct Order {
name: String,
@@ -26,6 +24,18 @@ fn create_order_template() -> Order {
}
}
+fn create_your_order(order_template: &Order) -> Order {
+ Order {
+ name: String::from("Hacker in Rust"),
+ year: order_template.year,
+ made_by_phone: order_template.made_by_phone,
+ made_by_mobile: order_template.made_by_mobile,
+ made_by_email: order_template.made_by_email,
+ item_number: order_template.item_number,
+ count: 1,
+ }
+}
+
#[cfg(test)]
mod tests {
use super::*;
@@ -34,7 +44,7 @@ mod tests {
fn your_order() {
let order_template = create_order_template();
// TODO: Create your own order using the update syntax and template above!
- // let your_order =
+ let your_order = create_your_order(&order_template);
assert_eq!(your_order.name, "Hacker in Rust");
assert_eq!(your_order.year, order_template.year);
assert_eq!(your_order.made_by_phone, order_template.made_by_phone);
diff --git a/exercises/structs/structs3.rs b/exercises/structs/structs3.rs
index 06fcaf2..4ce40c3 100644
--- a/exercises/structs/structs3.rs
+++ b/exercises/structs/structs3.rs
@@ -3,8 +3,6 @@
// exercise we have defined the Package struct and we want to test some logic attached to it,
// make the code compile and the tests pass! If you have issues execute `rustlings hint structs3`
-// I AM NOT DONE
-
#[derive(Debug)]
struct Package {
sender_country: String,
@@ -15,7 +13,7 @@ struct Package {
impl Package {
fn new(sender_country: String, recipient_country: String, weight_in_grams: i32) -> Package {
if weight_in_grams <= 0 {
- // Something goes here...
+ panic!("Weight must be positive")
} else {
return Package {
sender_country,
@@ -25,12 +23,12 @@ impl Package {
}
}
- fn is_international(&self) -> ??? {
- // Something goes here...
+ fn is_international(&self) -> bool {
+ self.sender_country != self.recipient_country
}
- fn get_fees(&self, cents_per_gram: i32) -> ??? {
- // Something goes here...
+ fn get_fees(&self, cents_per_gram: i32) -> i32 {
+ self.weight_in_grams*cents_per_gram
}
}
@@ -62,7 +60,7 @@ mod tests {
let sender_country = String::from("Spain");
let recipient_country = String::from("Spain");
- let cents_per_gram = ???;
+ let cents_per_gram = 3;
let package = Package::new(sender_country, recipient_country, 1500);
diff --git a/exercises/variables/variables1.rs b/exercises/variables/variables1.rs
index 4a3af73..db85e7e 100644
--- a/exercises/variables/variables1.rs
+++ b/exercises/variables/variables1.rs
@@ -6,9 +6,7 @@
// even after you already figured it out. If you got everything working and
// feel ready for the next exercise, remove the `I AM NOT DONE` comment below.
-// I AM NOT DONE
-
fn main() {
- x = 5;
+ let x = 5;
println!("x has the value {}", x);
}
diff --git a/exercises/variables/variables2.rs b/exercises/variables/variables2.rs
index 7774a8f..2119027 100644
--- a/exercises/variables/variables2.rs
+++ b/exercises/variables/variables2.rs
@@ -1,10 +1,8 @@
// variables2.rs
// Make me compile! Execute the command `rustlings hint variables2` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
- let x;
+ let x: i32 = 10;
if x == 10 {
println!("Ten!");
} else {
diff --git a/exercises/variables/variables3.rs b/exercises/variables/variables3.rs
index 30ec48f..7d84709 100644
--- a/exercises/variables/variables3.rs
+++ b/exercises/variables/variables3.rs
@@ -1,10 +1,8 @@
// variables3.rs
// Make me compile! Execute the command `rustlings hint variables3` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
- let x = 3;
+ let mut x = 3;
println!("Number {}", x);
x = 5; // don't change this line
println!("Number {}", x);
diff --git a/exercises/variables/variables4.rs b/exercises/variables/variables4.rs
index 77f1e9a..0931f89 100644
--- a/exercises/variables/variables4.rs
+++ b/exercises/variables/variables4.rs
@@ -1,9 +1,7 @@
// variables4.rs
// Make me compile! Execute the command `rustlings hint variables4` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
- let x: i32;
+ let x: i32 = 400;
println!("Number {}", x);
}
diff --git a/exercises/variables/variables5.rs b/exercises/variables/variables5.rs
index da37ae9..10ef314 100644
--- a/exercises/variables/variables5.rs
+++ b/exercises/variables/variables5.rs
@@ -1,11 +1,9 @@
// variables5.rs
// Make me compile! Execute the command `rustlings hint variables5` if you want a hint :)
-// I AM NOT DONE
-
fn main() {
let number = "T-H-R-E-E";
println!("Spell a Number : {}", number);
- number = 3;
+ let number = 3;
println!("Number plus two is : {}", number + 2);
}
diff --git a/exercises/variables/variables6.rs b/exercises/variables/variables6.rs
index 9866691..8afca4b 100644
--- a/exercises/variables/variables6.rs
+++ b/exercises/variables/variables6.rs
@@ -1,9 +1,7 @@
// variables6.rs
// Make me compile! Execute the command `rustlings hint variables6` if you want a hint :)
-// I AM NOT DONE
-
-const NUMBER = 3;
+const NUMBER: u32 = 3;
fn main() {
println!("Number {}", NUMBER);
}