mirror of https://github.com/gobeam/stringy.git
First n string/ Last n string function added
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README.md
27
README.md
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@ -46,6 +46,11 @@ A Golang string manipulation utility which have many useful functionality like c
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<td><a href="#toupper-string">ToUpper</a></td>
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<td><a href="#ucfirst-string">UcFirst</a></td>
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</tr>
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<tr>
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<td><a href="#firstlength-int-string">First</a></td>
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<td><a href="#lastlength-int-string">ToUpper</a></td>
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<td></td>
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</tr>
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</table>
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@ -142,6 +147,17 @@ Delimited is variadic function that takes two params delimiter and slice of stri
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You can chain to upper which with make result all uppercase or ToLower which will make result all lower case or Get which will return result as it is.
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#### First(length int) string
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First returns first n characters from provided input. It removes all spaces in string before doing so.
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```go
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fcn := stringy.New("4111 1111 1111 1111")
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first := fcn.First(4)
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fmt.Println(first) // 4111
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```
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#### Get() string
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Get simply returns result and can be chained on function which returns StringManipulation interface view above examples
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@ -160,6 +176,17 @@ KebabCase/slugify is variadic function that takes one Param slice of strings nam
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You can chain to upper which with make result all uppercase or ToLower which will make result all lower case or Get which will return result as it is.
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#### Last(length int) string
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Last returns last n characters from provided input. It removes all spaces in string before doing so.
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```go
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lcn := stringy.New("4111 1111 1111 1348")
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last := lcn.Last(4)
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fmt.Println(last) // 1348
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```
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#### LcFirst() string
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LcFirst simply returns result by lower casing first letter of string and it can be chained on function which return StringManipulation interface
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@ -66,4 +66,12 @@ func main() {
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kebabStr := str.KebabCase("?", "")
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fmt.Println(kebabStr.ToUpper()) // HELLO-MAN-HOW-ARE-YOU
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fcn := stringy.New("4111 1111 1111 1111")
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first := fcn.First(4)
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fmt.Println(first) // 4111
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lcn := stringy.New("4111 1111 1111 1348")
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last := lcn.Last(4)
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fmt.Println(last) // 1348
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}
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18
message.go
18
message.go
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@ -2,14 +2,16 @@ package stringy
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// const below are used in packages
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const (
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First = "first"
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Last = "last"
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Left = "left"
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Right = "right"
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Both = "both"
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OddError = "odd number rule provided please provide in even count"
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SelectCapital = "([a-z])([A-Z])"
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ReplaceCapital = "$1 $2"
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First = "first"
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Last = "last"
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Left = "left"
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Right = "right"
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Both = "both"
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OddError = "odd number rule provided please provide in even count"
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SelectCapital = "([a-z])([A-Z])"
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ReplaceCapital = "$1 $2"
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LengthError = "passed length cannot be greater than input length"
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InvalidLogicalString = "invalid string value to test boolean value"
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)
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// False is slice of array for false logical representation in string
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26
stringy.go
26
stringy.go
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@ -23,8 +23,10 @@ type StringManipulation interface {
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CamelCase(rule ...string) string
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ContainsAll(check ...string) bool
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Delimited(delimiter string, rule ...string) StringManipulation
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First(length int) string
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Get() string
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KebabCase(rule ...string) StringManipulation
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Last(length int) string
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LcFirst() string
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Lines() []string
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Pad(length int, with, padType string) string
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@ -86,7 +88,7 @@ func (i *input) Boolean() bool {
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if on {
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return true
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}
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panic(errors.New("invalid string value to test boolean value"))
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panic(errors.New(InvalidLogicalString))
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}
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// CamelCase is variadic function which takes one Param rule i.e slice of strings and it returns
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@ -131,6 +133,16 @@ func (i *input) Delimited(delimiter string, rule ...string) StringManipulation {
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return i
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}
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// First returns first n characters from provided input. It removes all spaces in string before doing so.
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func (i *input) First(length int) string {
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input := getInput(*i)
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input = strings.ReplaceAll(input, " ", "")
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if len(input) < length {
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panic(errors.New(LengthError))
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}
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return input[0:length]
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}
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// Get simply returns result and can be chained on function which
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// returns StringManipulation interface
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func (i *input) Get() string {
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@ -150,6 +162,18 @@ func (i *input) KebabCase(rule ...string) StringManipulation {
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return i
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}
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// Last returns last n characters from provided input. It removes all spaces in string before doing so.
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func (i *input) Last(length int) string {
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input := getInput(*i)
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input = strings.ReplaceAll(input, " ", "")
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inputLen := len(input)
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if len(input) < length {
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panic(errors.New(LengthError))
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}
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start := inputLen - length
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return input[start:inputLen]
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}
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// LcFirst simply returns result by lower casing first letter of string and it can be chained on
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// function which return StringManipulation interface
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func (i *input) LcFirst() string {
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@ -158,3 +158,19 @@ func TestInput_UcFirst(t *testing.T) {
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t.Errorf("Expected: to be %s but got: %s", against, val)
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}
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}
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func TestInput_First(t *testing.T) {
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fcn := New("4111 1111 1111 1111")
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against := "4111"
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if first := fcn.First(4); first != against {
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t.Errorf("Expected: to be %s but got: %s", against, first)
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}
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}
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func TestInput_Last(t *testing.T) {
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lcn := New("4111 1111 1111 1348")
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against := "1348"
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if last := lcn.Last(4); last != against {
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t.Errorf("Expected: to be %s but got: %s", against, last)
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}
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}
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