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labs.md

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Lab 1 - Fibonacci

Create an executable go program in directory 01_fib/USERNAME Write a function that prints the first n Fibonacci numbers

func fib(n int)

Call fib(7) in main to print

1
1
2
3
5
8
13

Bonus points: For negative n print Negafibonacci numbers.

Lab 2 - Bubble sort

Create an executable go program in directory 02_bubble/USERNAME Write a function that returns a sorted copy of int slice s using bubble sort:

func bubble(s []int) []int

Call fmt.Println(bubble([]int{3, 2, 1, 5})) in main to print:

[1 2 3 5]

Bonus points: implement Insertion sort Extra bonus points: implement an O(n log(n)) sorting algorithm

Lab 3 - Letter frequency

Create an executable go program in directory 03_letters/USERNAME Write a function that returns a mapping of each letter to its frequency:

func letters(s string) map[rune]int

Write a function that returns a sorted slice of strings with elements "{key}:{val}". Use package sort:

func sortLetters(m map[rune]int) []string

Call fmt.Println(strings.Join(sortLetters(letters("aba"))), "\n") in main to print:

a:2
b:1

Bonus points: comprehensive tests

Lab 4 - Numeronym

Create an executable go program in directory 04_numeronym/USERNAME Write a function that returns a slice of numeronyms for its input strings:

func numeronyms(vals ...string) []string

Call fmt.Println(numeronyms("accessibility", "Kubernetes", "abc")) in main to print:

[a11y K8s abc]

Lab 5 - Stringer

Create an executable go program in directory 05_stringer/USERNAME Make the IPAddr type implement fmt.Stringer to print the address as a dotted quad Find hints at tour of go exercise: stringers Call fmt.Println(IPAddr{127, 0, 0, 1}) in main to print:

127.0.0.1

Lab 6 - CRUD puppy with interface

Create an executable go program in directory 06_puppy/USERNAME (see hints) Implement a Puppy struct containing ID, Breed, Colour, Value Create Storer interface with crud methods for Puppy Write a MapStore implementation of Storer backed by a map Write a SyncStore implementation of Storer backed by a sync.map Keep all implementation files in the same folder and in package main Test against the Storer interface and run in suite with both implementations

Lab 7 - Errors

Create an executable go program in directory 07_errors/USERNAME Copy the CRUD puppy from upstream master 06_puppy/USERNAME Add a custom error type Error with fields Message and Code Extend the Storer interface for all methods to also return error Create errors for:

    - Value < 0
    - ID not found in Read, Update and Delete

Add locking for proper use of sync.Map Bonus points: Add a third Storer implementation using leveldb

Lab 8 - Project Layout

Copy the CRUD puppy from upstream master 07_errors/USERNAME Create directory 08_project/USERNAME containing

├── README.md
├── go.mod
├── go.sum
├── pkg
│   └── USERNAME-puppy
│       ├── types.go
│       ├── types_test.go
│       ├── errors.go
│       ├── errors_test.go
│       └── store
│           ├── storer.go
│           └── .... store files and tests, e.g. mapstore.go
├── cmd
│   └── USERNAME-puppy-server
│       └── main.go
└── vendor

Add project introduction and how to build, run & test it to README.md

Lab 9 - JSON puppy

Create directory 09_json/USERNAME containing a copy of upstream master 08_project/USERNAME Add JSON tags to puppy data type Test marshalling and unmarshalling using require.jsoneq Add command line flag -d FILE with long form --data FILE using kingpin.v2 FILE should contain an array of puppies in JSON format. Parse this file and store its contents.

Lab 10 - Puppy REST

Create directory 10_rest/USERNAME containing a copy of upstream master 09_json/USERNAME Add file pkg/puppy/rest.go implementing:

GET    /api/puppy/{id}
POST   /api/puppy/          Payload: Puppy JSON without ID
PUT    /api/puppy/{id}      Payload: Puppy JSON without ID
DELETE /api/puppy/{id}

Use net/http/httptest for testing Add flag -p PORT with long flag --port PORT to command line flags Add flag -s STORE with long flag --store STORE with accepted values:

map, sync, db

Document the API in README.md

Lab 11 - Puppy Notifications

Create directory 11_notify/USERNAME containing a copy of upstream master 10_rest/USERNAME Create cmd/lostpuppy-service/main.go running single endpoint:

POST   /api/lostpuppy/          Payload: { id: PUPPY_ID }
This stubbed endpoint returns with 2 second delay:
HTTP status 201 for even IDs
HTTP status 500 for odd IDs

Update Puppy Delete method to notify lostpuppy-service in a goroutine and log response code asynchronously.