organizing/adding some useful snippets in go folder

snippets/least-common-multiple/main.go

@@ -0,0 +1,46 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(lcm([]int{2, 4, 8}), " -> expect 8")
+	fmt.Println(lcm([]int{25, 15, 18}), " -> expect 450")
+}
+
+// Better solution to finding a least common multiple
+func lcm(sNum []int) int {
+	ans := 1
+
+	// start iterating from the number 2
+	for i := 2; ; {
+		// booleans to track if a number has been added to the ans (LCM)
+		// and if all of the values in the slice are 1, in which case we are done
+		changeMade, allOnes := false, true
+		// iterate over all elements in the sNum slice
+		for index, num := range sNum {
+			if num%i == 0 && !changeMade {
+				changeMade = true // update this boolean flag
+				ans *= i          // increment answer
+				sNum[index] /= i  // need to use this notation because num is pass by value
+				// do not increment i
+			} else if num%i == 0 {
+				// need to divide the element, but not increment ans (same prime factor as a previous element)
+				sNum[index] /= i
+			}
+
+			// if any of the values in the slice are not one, flip the allOnes flag to false
+			// to indicate that we're not done with our outer loop
+			if num != 1 {
+				allOnes = false
+			}
+		}
+
+		// if all values in sNum are 1, we're done & can return the answer
+		if allOnes {
+			return ans
+		} else if !changeMade {
+			// if a change was not made & not all values are one, increment i
+			i++
+		}
+	}
+}

snippets/read-file/input.txt

@@ -0,0 +1,4 @@
+<x=14, y=2, z=8>
+<x=7, y=4, z=10>
+<x=1, y=17, z=16>
+<x=-4, y=-1, z=1>

snippets/read-file/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	stringSlice := readInputFile("./input.txt")
+	fmt.Println(stringSlice)
+}
+
+// helper function to put the input file into a slice of strings
+// (each elements is a line of the txt file)
+func readInputFile(path string) []string {
+	// var pixelString string
+	resultSlice := make([]string, 0)
+	absPath, _ := filepath.Abs(path)
+
+	file, err := os.Open(absPath)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		// pixelString = line
+		resultSlice = append(resultSlice, line)
+	}
+
+	// return pixelString
+	return resultSlice
+}