Contents

class SimpleCipher {
    key: string

    constructor(key?: string) {
        if (key === undefined) {
            for (let i = 0; i < 100; i++) {
                this.key += String.fromCharCode(Math.random() * 26 + 97)
            }
        } else {
            this.key = key!
        }
        if (!/[a-z]/.test(key!)) {
            throw new Error('Bad key')
        }
    }

    encode(decodedMessage: string): string {
        let encodedMessage = ''
        for (let i = 0; i < decodedMessage.length; i++) {
            let encodedChar = String.fromCharCode(decodedMessage.charCodeAt(i) + (this.key.charCodeAt(i % this.key.length) - 97))
            if (encodedChar.charCodeAt(0) > 122) {
                encodedChar = String.fromCharCode(encodedChar.charCodeAt(0) - 26)
            }
            encodedMessage += encodedChar
        }
        return encodedMessage
    }

    decode(encodedMessage: string): string {
        let decodedMessage = ''
        for (let i = 0; i < encodedMessage.length; i++) {
            let decodedChar = String.fromCharCode(encodedMessage.charCodeAt(i) - (this.key.charCodeAt(i % this.key.length) - 97))
            if (decodedChar.charCodeAt(0) < 97) {
                decodedChar = String.fromCharCode(decodedChar.charCodeAt(0) + 26)
            }
            decodedMessage += decodedChar
        }
        return decodedMessage
    }
}

export default SimpleCipher

Version data entries

67 entries across 67 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.179	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.178	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.177	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.176	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.175	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.174	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.173	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.172	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.171	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.170	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.169	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.167	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.166	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.165	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.164	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.163	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.162	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.161	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts
trackler-2.2.1.160	tracks/typescript/exercises/simple-cipher/simple-cipher.example.ts