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Contents
## Implementation
The definition of the Cipher interface is located in
[cipher.go](./cipher.go).
Your implementations should conform to the Cipher interface.
```go
type Cipher interface {
Encode(string) string
Decode(string) string
}
```
It is expected that `Encode` will ignore all values in the string that
are not A-Za-z, they will not be represented in the output. The output
will be also normalized to lowercase.
The functions used to obtain the ciphers are:
```go
func NewCaesar() Cipher { }
func NewShift(distance int) Cipher { }
func NewVigenere(key string) Cipher { }
```
Argument for `NewShift` must be in the range 1 to 25 or -1 to -25.
Zero is disallowed. For invalid arguments `NewShift` returns nil.
Argument for `NewVigenere` must consist of lower case letters a-z
only. Values consisting entirely of the letter 'a' are disallowed.
For invalid arguments `NewVigenere` returns nil.
Version data entries
152 entries across 152 versions & 1 rubygems