util

func CdBack ¶ added in v0.1.16

func CdBack(backDir string)

CdBack returns back to previous path.

func CdToThis ¶

func CdToThis()

CdToThis changes `working directory` to the current directory of function that calls it.

A use case is when a function at coding file reads a relative file, however the end user, at run time, executes the coding file at a different directory to the coding file. As relative path has been used, one would change from any directory at run time to `current` directory where function is called to get the correct relative path.

Example: There a Go package in a os directory as follow:

• os-home | +--go-package | | | +--data | | | | | +--data-file.txt | | | +--sub-package | | | +--go-file.go | +--other-folder

There's a function `ReadData` in `go-file.go` that read a data file `data-file.txt` in other directory using a relative filepath to its - I.e: "../data/data-file.txt". Now, a end user run `go-file.go` from `other-folder` directory which is not at the same directory to `go-file.go` file. `ReadData` function would be panic if there was no helper to change directory from directory where end user executes the code ("os-home/other-folder") to directory of `go-file.go`. `CdToThis` does this job.

func ErrorContains ¶

func ErrorContains(out error, want string) bool

ErrorContains checks if the error message in out contains the text in want Ref. https://stackoverflow.com/questions/42035104

Example usage if !ErrorContains(err, "unexpected banana") { t.Errorf("unexpected error: %v", err) }

if !ErrorContains(err, "") { t.Errorf("unexpected error: %v", err) }

func FileSize ¶

func FileSize(filepath string) (int64, error)

FileSize returns length of given file using `os.Stat()` Ref. https://stackoverflow.com/questions/17133590

func LogError ¶

func LogError(err error)

LogError logs error with the function name as well.

func MakeRange ¶

func MakeRange(start, end int) []int

* // Makerange creates a sequence of number (range) * // Ref. https://stackoverflow.com/questions/39868029 * func MakeRange(min, max int) []int { * if min == max { * return []int{} * } * a := make([]int, max-min+1) * for i := range a { * a[i] = min + i * } * return a * } *

func MinMax ¶

func MinMax(array []int) (int, int)

MinMax returns min and max from input int array

func MinMaxFloat64 ¶

func MinMaxFloat64(array []float64) (float64, float64)

MinMax returns min and max from input int array

func ReadAllLn ¶

func ReadAllLn(filepath string, keepBreakLine bool) ([]string, error)

ReadAllLn reads all line by line from a file using bufio.scanner

func StringInSlice ¶

func StringInSlice(a string, list []string) bool

StringInSlice check whether given string is in a slice

func StringIndex ¶

func StringIndex(s, sub string) (index int, err error)

StringIndex returns index (start) for substring on a given string It returns -1 and error if not matching

func ToASCII ¶

func ToASCII(s string) string

ToASCII converts string to ASCII form Ref. https://stackoverflow.com/questions/12668681

func ToGrapheme ¶

func ToGrapheme(s string) string

ToGrapheme converts string to grapheme TODO: should we include this func? Ref: https://github.com/golang/go/issues/14820

func TraceError ¶

func TraceError(err error) error

HandleError wraps original error message with function and source code position where error is captured. Ref. https://stackoverflow.com/questions/24809287

func Zip ¶

func Zip(a, b, c interface{}) error

Zip zips 2 slices in first and second arguments to third argument Ref: https://stackoverflow.com/questions/26957040

Usage Example a := []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0} b := []int{0, 9, 8, 7, 6, 5, 4, 3, 2, 1} c := [][2]int{}

e := zip(a, b, &c)

if e != nil {
		fmt.Println(e)
 	return
}

fmt.Println(c)