10 examples of 'golang read file' in Go

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10func main() {
11 input := util.ReadFile("../input.txt")
12
13 lines := strings.Split(input, "\n")
14
15 grid := make([][]string, len(lines))
16 for i, v := range lines {
17 grid[i] = strings.Split(v, "")
18 }
19
20 // can map biodiversity scores because they're essentially bitmaps
21 previousBiodiversities := map[int]bool{getBiodiversity(grid): true}
22
23 // run indefinitely
24 for {
25 // step through a minute
26 grid = stepMinute(grid)
27 newBiodiversity := getBiodiversity(grid)
28
29 // if new biodiversity score is already in the map, print it and exit
30 if previousBiodiversities[newBiodiversity] {
31 fmt.Println("Repeated biodiversity score", newBiodiversity)
32 return
33 }
34
35 // set biodiversity score into in map
36 previousBiodiversities[newBiodiversity] = true
37 }
38}
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192func (f Files) FileRead(path string) ([]byte, error) {
193 return ioutil.ReadFile(path)
194}
46func (s *FileSystemImageSource) read(file string) ([]byte, error) {
47 buf, err := ioutil.ReadFile(file)
48 if err != nil {
49 return nil, ErrInvalidFilePath
50 }
51 return buf, nil
52}
10func main() {
11 // need to read the input.txt file and split each line into a slice
12 input := util.ReadFile("../input.txt")
13 stringSlice := strings.Split(input, "\n")
14
15 // split into a 2D grid with each character
16 gridSlice := make([][]string, len(stringSlice))
17 for i, str := range stringSlice {
18 gridSlice[i] = strings.Split(str, "")
19 }
20
21 // will be the final result value
22 var result int
23 var finalCoords [2]int
24 // iterate through entire slice, for each asteroid found, call a helper function
25 for rowIndex, rowSlice := range gridSlice {
26 for colIndex, element := range rowSlice {
27 if element == "#" {
28 // # are "asteroids", . are empty space
29 // helper function will return how many asteroids are "findable" from the current asteroid
30 visibleFromElement := visibleFromAsteroid(gridSlice, rowIndex, colIndex)
31
32 // take max of return of helper function at end of each loop
33 if result < visibleFromElement {
34 result = visibleFromElement
35 finalCoords[0], finalCoords[1] = rowIndex, colIndex
36 }
37 }
38 }
39 }
40
41 // print out the max found
42 fmt.Printf("best asteroid for the station: row[%v] col[%v]\n", finalCoords[0], finalCoords[1]) // [13, 11]
43 fmt.Println("from 13, 11 (y, x)", result)
44}
12func main() {
13 fmt.Printf("Uncompressed length: v1: %v v2: %v", decompressString(common.ReadEntireFile(inputPath)), calcDecompressed(common.ReadEntireFile(inputPath)))
14}
22func read() {
23 file, err := os.Open("textfile.txt")
24 if err != nil {
25 panic(err)
26 }
27 defer file.Close()
28 fmt.Println("Read file:")
29 io.Copy(os.Stdout, file)
30}
12func main() {
13 // parse input file into a slice of numbers
14 input := util.ReadFile("../input.txt")
15 // input := "03036732577212944063491565474664" // test should output "84462026"
16 characters := strings.Split(input, "")
17
18 digits := make([]int, len(characters)*10000)
19 for i := 0; i < 10000; i++ {
20 for j, v := range characters {
21 digits[i*len(characters)+j], _ = strconv.Atoi(v)
22 }
23 }
24
25 var offsetIndex int
26 for i := 0; i < 7; i++ {
27 offsetIndex *= 10
28 offsetIndex += digits[i]
29 }
30 fmt.Println("offsetIndex", offsetIndex)
31
32 // run through 100 phases, overwriting digits
33 for i := 0; i < 100; i++ {
34 digits = getNextOutputNumber(digits)
35 // output a time to make sure this is running fast enough
36 fmt.Printf("output received at %v, %v to go\n", time.Now(), 100-i-1)
37 }
38
39 // Transform into github.com/alexchao26/advent-of-code-go output
40 var firstEightDigits int
41 for i := 0; i < 8; i++ {
42 firstEightDigits *= 10
43 firstEightDigits += digits[i+offsetIndex]
44 }
45 fmt.Printf("\nOffset 8 digits after 100 phases: %v\n", firstEightDigits)
46 fmt.Println("Expect 84462026 for test, 36265589 for actual input")
47}
58func readJsonFile(path string) (jsonData []byte, err error) {
59 jsonData = nil
60 _, err = os.Stat(path)
61 if err != nil {
62 if len(path) == 0 {
63 //log.log.With Println("Need request json file")
64 } else {
65 fmt.Printf("Not Found %s \n", path)
66 }
67 return
68 }
69
70 jsonData, err = ioutil.ReadFile(path)
71 if err != nil {
72 fmt.Printf("dots_client_controller.readJsonFile -- File error: %v\n", err)
73 return
74 }
75 return
76}
66func (cache *Cache) Read(envkeyParam string) ([]byte, error) {
67 path := filepath.Join(cache.Dir, envkeyParam)
68 b, err := ioutil.ReadFile(path)
69 select {
70 case cache.Done <- err:
71 default:
72 }
73 return b, err
74}
13func readFile(filepath string) []byte {
14 // TODO only read as deep into the file as we need
15 bytes, err := ioutil.ReadFile(filepath)
16
17 if err != nil {
18 fmt.Print(err)
19 }
20
21 return bytes
22}

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