The challenge
Create a method IsUpperCase to see whether the string is ALL CAPS. For example:
type MyString string
MyString("c").IsUpperCase() == false
MyString("C").IsUpperCase() == true
MyString("hello I AM DONALD").IsUpperCase() == false
MyString("HELLO I AM DONALD").IsUpperCase() == true
MyString("ACSKLDFJSgSKLDFJSKLDFJ").IsUpperCase() == false
MyString("ACSKLDFJSGSKLDFJSKLDFJ").IsUpperCase() == true
In this challenge, a string is said to be in ALL CAPS whenever it does not contain any lowercase letter so any string containing no letters at all is trivially considered to be in ALL CAPS.
The solution in Golang
Option 1:
package solution
import "strings"
type MyString string
func (s MyString) IsUpperCase() bool {
return s == MyString(strings.ToUpper(string(s)))
}
Option 2:
package solution
type MyString string
func (s MyString) IsUpperCase() bool {
for _, letter := range s {
if int(letter) >= 97 && int(letter) <= 122 {
return false
}
}
return true
}
Option 3:
package solution
import "regexp"
type MyString string
func (s MyString) IsUpperCase() bool {
r, _ := regexp.Compile(`^[A-Z\s]+$`)
return r.MatchString(string(s))
}
Test cases to validate our solution
package our_test
import (
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
)
var _ = Describe("Sample Test Cases:", func() {
It("Should return the correct values", func() {
Expect(MyString("a").IsUpperCase()).To(Equal(false))
Expect(MyString("b").IsUpperCase()).To(Equal(false))
Expect(MyString("c").IsUpperCase()).To(Equal(false))
Expect(MyString("d").IsUpperCase()).To(Equal(false))
Expect(MyString("e").IsUpperCase()).To(Equal(false))
Expect(MyString("f").IsUpperCase()).To(Equal(false))
Expect(MyString("g").IsUpperCase()).To(Equal(false))
Expect(MyString("h").IsUpperCase()).To(Equal(false))
Expect(MyString("i").IsUpperCase()).To(Equal(false))
Expect(MyString("j").IsUpperCase()).To(Equal(false))
Expect(MyString("k").IsUpperCase()).To(Equal(false))
Expect(MyString("l").IsUpperCase()).To(Equal(false))
Expect(MyString("m").IsUpperCase()).To(Equal(false))
Expect(MyString("n").IsUpperCase()).To(Equal(false))
Expect(MyString("o").IsUpperCase()).To(Equal(false))
Expect(MyString("p").IsUpperCase()).To(Equal(false))
Expect(MyString("q").IsUpperCase()).To(Equal(false))
Expect(MyString("r").IsUpperCase()).To(Equal(false))
Expect(MyString("s").IsUpperCase()).To(Equal(false))
Expect(MyString("t").IsUpperCase()).To(Equal(false))
Expect(MyString("u").IsUpperCase()).To(Equal(false))
Expect(MyString("v").IsUpperCase()).To(Equal(false))
Expect(MyString("w").IsUpperCase()).To(Equal(false))
Expect(MyString("x").IsUpperCase()).To(Equal(false))
Expect(MyString("y").IsUpperCase()).To(Equal(false))
Expect(MyString("z").IsUpperCase()).To(Equal(false))
Expect(MyString("false").IsUpperCase()).To(Equal(false))
Expect(MyString("true").IsUpperCase()).To(Equal(false))
Expect(MyString("False").IsUpperCase()).To(Equal(false))
Expect(MyString("True").IsUpperCase()).To(Equal(false))
})
})
