A simple crypto to typescript

crypto.ts

class Crypto {
    constructor(private salt: string) { }

    public encrypt(text: string) {
        return this.textToChars(text)
            .map(code => this.applySaltToChar(code))
            .map(char => this.byteHex(char))
            .join('');
    }

    public decrypt(text: string) {
        return text.match(/.{1,2}/g)
            .map(hex => parseInt(hex, 16))
            .map(code => this.applySaltToChar(code))
            .map(charCode => String.fromCharCode(charCode))
            .join('');
    }

    private textToChars(text: string): number[] {
        return text.split('').map(c => c.charCodeAt(0));
    }

    private byteHex(char: number): string {
        return ("0" + char.toString(16)).substr(-2);
    }

    private applySaltToChar(code: number): number {
        return this.textToChars(this.salt)
            .reduce((a, b) => a ^ b, code);
    }
}