day 1 solution

puzzles/day01/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"fmt"
+	"github.com/kylehoehns/aoc-2023-go/pkg/files"
+	"github.com/kylehoehns/aoc-2023-go/pkg/ints"
+	"strconv"
+	"strings"
+	"unicode"
+)
+
+func main() {
+	fmt.Println("Part 1: ", getCalibrationValues("input.txt"))
+	fmt.Println("Part 2: ", getCalibrationValues("input.txt"))
+}
+
+func getCalibrationValues(name string) int {
+	lines := files.ReadLines(name)
+	totalCalibrationValue := 0
+	for _, line := range lines {
+		firstDigit := getFirstDigit(line)
+		lastDigit := getLastDigit(line)
+		combined := strconv.Itoa(firstDigit) + strconv.Itoa(lastDigit)
+		totalCalibrationValue += ints.FromString(combined)
+	}
+	return totalCalibrationValue
+}
+
+func getFirstDigit(s string) int {
+	for i := 0; i < len(s); i++ {
+		if found, d := containsSpelledDigit(s[:i]); found {
+			return d
+		} else if unicode.IsDigit(rune(s[i])) {
+			return int(s[i] - '0')
+		}
+	}
+	panic("No digit found in " + s)
+}
+
+func getLastDigit(s string) int {
+	for i := len(s) - 1; i >= 0; i-- {
+		if found, d := containsSpelledDigit(s[i:]); found {
+			return d
+		} else if unicode.IsDigit(rune(s[i])) {
+			return int(s[i] - '0')
+		}
+	}
+	panic("No digit found in " + s)
+}
+
+var spelledDigits = map[string]int{
+	"one":   1,
+	"two":   2,
+	"three": 3,
+	"four":  4,
+	"five":  5,
+	"six":   6,
+	"seven": 7,
+	"eight": 8,
+	"nine":  9,
+}
+
+func containsSpelledDigit(s string) (bool, int) {
+	for k, v := range spelledDigits {
+		if strings.Contains(s, k) {
+			return true, v
+		}
+	}
+	return false, 0
+}

puzzles/day01/main_test.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPart1(t *testing.T) {
+
+	t.Run("Part 1", func(t *testing.T) {
+		expected := 142
+		actual := getCalibrationValues("test-input.txt")
+		assert.Equal(t, expected, actual)
+	})
+
+}
+
+func TestPart2(t *testing.T) {
+
+	t.Run("Part 2", func(t *testing.T) {
+		expected := 281
+		actual := getCalibrationValues("test-input-part-two.txt")
+		assert.Equal(t, expected, actual)
+	})
+
+}

puzzles/day01/test-input-part-two.txt

@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen

puzzles/day01/test-input.txt

@@ -0,0 +1,4 @@
+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet