first commit

.gitignore

@@ -13,3 +13,6 @@
 
 # Dependency directories (remove the comment below to include it)
 # vendor/
+
+# Other stuff
+*.log

README.md

@@ -1,2 +1,8 @@
 # advent-of-code-2021
 Advent of Code 2021
+
+# Usage
+run `make #` to execute the solution for a given day
+
+# Known Issues
+The VSCode integrated debugger isn't working right with WSL and GO :<

day-0/data.txt

@@ -0,0 +1,2 @@
+this is some data in a txt file
+in can have more than one line

day-0/files.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+)
+
+func tryMe(e error) {
+	if e != nil {
+		fmt.Println("OH SNAP!")
+		panic(e)
+	}
+}
+
+func files() {
+	dat, err := os.ReadFile("./data.txt")
+	tryMe(err)
+
+	fmt.Print(string(dat))
+	fmt.Println("\n---")
+
+	f, err := os.Open("./data.txt")
+	tryMe(err)
+	coupleBytes := make([]byte, 10)
+	num, err := f.Read(coupleBytes)
+	tryMe(err)
+	fmt.Println(num, string(coupleBytes))
+
+	reader := bufio.NewReader(f)
+	rBuf, err := reader.Peek(5)
+	tryMe(err)
+	fmt.Println("buff reader", string(rBuf))
+
+	f.Close()
+}

day-0/main.go

@@ -0,0 +1,274 @@
+package main
+
+import (
+	"fmt"
+	"math"
+	"math/rand"
+	"strings"
+	"time"
+
+	"rsc.io/quote"
+)
+
+const Answer = 42
+
+func main() {
+	files()
+	// runStuff()
+
+	fmt.Println()
+}
+
+func runStuff() {
+	fmt.Println("Hello world")
+	fmt.Println(quote.Go())
+
+	mathFn()
+
+	fmt.Println("add stuff", sumStuff(2, 3))
+
+	a, b := doubleTrouble()
+	fmt.Println(a, b)
+
+	declTypes()
+	basicTypes()
+
+	fmt.Println("The answer is", Answer)
+
+	bitShifting()
+
+	loops()
+
+	conditions()
+
+	switching()
+
+	deferFn()
+
+	pointies()
+
+	buildingThings()
+
+	lists()
+
+	makingThings()
+
+	mapping()
+
+	funcFun()
+
+	methods()
+}
+
+func mathFn() {
+	fmt.Println("math")
+	fmt.Println(math.Sin(2))
+
+	fmt.Println("random numbers")
+	fmt.Println(rand.Intn(100), rand.ExpFloat64())
+}
+
+func sumStuff(x int, y int) int {
+	return x + y
+}
+
+func doubleTrouble() (string, string) {
+	return "foo", "bar"
+}
+
+func declTypes() {
+	var i, j, k int = 1, 2, 3
+	o := 42
+	foo, bar := "zap", "zing"
+	fmt.Println(i, j, k, o, foo, bar)
+}
+
+func basicTypes() {
+	var b bool = true
+	var s string = "string"
+	var i int = 99
+	//  int8,16,32,64
+	// uint8,16,32,64,uintptr
+	// byte, rune
+	var f float32 = 1.23
+	var c complex64 = complex64(123)
+
+	fmt.Println(b, s, i, f, c)
+}
+
+func bitShifting() {
+	val := 1 << 4
+	val2 := val >> 2
+	fmt.Println("bits shifting", val, val2)
+}
+
+func loops() {
+	for i := 0; i < 10; i++ {
+		fmt.Print(1<<i, ",")
+	}
+	fmt.Println()
+
+	var fibs = []int{1, 2, 3, 5, 8, 13, 21}
+	for idx, val := range fibs {
+		fmt.Print(idx, ":", val, ",")
+	}
+	fmt.Println()
+}
+
+func conditions() {
+	if Answer == 42 {
+		fmt.Println("sorry for the inconvenience")
+	}
+	if v := Answer << 2; v > 100 {
+		fmt.Println("that's a better answer", v)
+	}
+	if true == false {
+		fmt.Println("i feel rather like a sofa")
+	} else {
+		fmt.Println("stability of the universe confirmed")
+	}
+}
+
+func switching() {
+	val := "back"
+
+	switch val {
+	case "blade":
+		fmt.Println("sharp!")
+	case "back":
+		fmt.Println("snazzy!")
+	default:
+		fmt.Println("dunno!")
+	}
+
+	today := time.Now().Weekday()
+	switch today {
+	case time.Saturday:
+		fmt.Println("party time")
+	case time.Saturday - 1:
+		fmt.Println("TGIF")
+	default:
+		fmt.Println("another time")
+	}
+
+	switch {
+	case true == false:
+		fmt.Println("never")
+	case Answer > 1:
+		fmt.Println("the cool kids way to write if/else blocks")
+	default:
+		fmt.Println("we fell out")
+	}
+}
+
+func deferFn() {
+	defer fmt.Println("I came first!")
+	fmt.Println("But I was executed first!")
+	defer fmt.Println("And I was last!")
+}
+
+func pointies() {
+	var p *int
+	badNum := 666
+	p = &badNum
+	fmt.Println("bad num", *p, p)
+}
+
+func buildingThings() {
+	type Aminal struct {
+		color  string
+		age    int
+		flavor bool
+	}
+	c := Aminal{"blue", 2, false}
+	fmt.Println(c)
+
+	p := &c
+	p.color = "black"
+	fmt.Println(*p)
+
+	d := &Aminal{age: 17}
+	fmt.Println(d, *d)
+}
+
+func lists() {
+	var a [10]string
+	a[0] = "Hello"
+	a[6] = "World"
+	bestPart := a[0:7]
+
+	evens := [5]int{2, 4, 6, 8, 10}
+
+	fmt.Println(bestPart, evens[1:3], evens[3:])
+	fmt.Println("best", len(bestPart), cap(bestPart))
+
+	slice := []struct {
+		label string
+		value int
+	}{
+		{"foo", 1},
+		{"bar", 2},
+		{"baz", 3},
+	}
+	fmt.Println("slices", slice)
+
+	pie := evens[0:]
+	pie2 := append(pie, 12)
+	fmt.Println("pie?", pie, pie2)
+}
+
+func makingThings() {
+	a := make([]int, 5)
+	b := make([]int, 0, 10)
+
+	fmt.Println("make", a, b)
+}
+
+func mapping() {
+	type RGB struct {
+		r int
+		g int
+		b int
+	}
+	colorMap := make(map[string]RGB)
+	colorMap["red"] = RGB{255, 0, 0}
+	colorMap["puce"] = RGB{204, 136, 153}
+
+	fmt.Println(colorMap)
+
+	var favoriteShades = map[string]RGB{
+		"sprange":     {1, 2, 3},
+		"guarve":      {4, 5, 6},
+		"light urple": {7, 8, 9},
+	}
+	fmt.Println(favoriteShades)
+
+	elem, found := favoriteShades["poop"]
+	fmt.Println("found it?", found, elem)
+}
+
+func funcFun() {
+	workIt := func(s string, fn func(string) string) string {
+		return fn(s)
+	}
+
+	daft := workIt("harder", strings.ToUpper) //+ makeIt("better", strings.ToLower) +  doIt("faster", makesUs("stronger"))))
+	fmt.Println("punk", daft)
+}
+
+func closures() {
+	// wut?
+}
+
+type Madness struct {
+	peak, trough int
+}
+
+func (m Madness) Avg() int {
+	return (m.peak + m.trough) / 2
+}
+
+func methods() {
+	redHaze := Madness{98, 47}
+	fmt.Println("yo", redHaze.Avg(), Madness.Avg(redHaze))
+}

go.mod

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+module AoC2021
+
+go 1.17
+
+require rsc.io/quote v1.5.2
+
+require (
+	golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c // indirect
+	rsc.io/sampler v1.3.0 // indirect
+)

go.sum

@@ -0,0 +1,6 @@
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:qgOY6WgZOaTkIIMiVjBQcw93ERBE4m30iBm00nkL0i8=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.2 h1:w5fcysjrx7yqtD/aO+QwRjYZOKnaM9Uh2b40tElTs3Y=
+rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=

makefile

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+default: 0
+	# This is my 2021 Advent of Code project
+
+0:
+	cd day-$@; go run .