Function mapper

src/Strings.ts:153–169

(u: number)

    escaper: (codePoint: number) => string
): (u: number) => string {
    function mapper(u: number): string {
        switch (u) {
            case 0x5c:
                return "\\\\";
            case 0x22:
                return '\\"';
            case 0x0a:
                return "\\n";
            case 0x09:
                return "\\t";
            default:
                if (printablePredicate(u)) {
                    return String.fromCharCode(u);
                }
                return escaper(u);
        }
    }
    return mapper;
}