Esolang interpreters

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> const _input = '+'.repeat(65) + '.' + '+.'.repeat(25);
> esoMsf.msf(_input)
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

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const esoMsf = {
    msfIncr: (mem, lim) => (mem + 1) % lim,

    msfEval: function(data, chr) {
        if (chr === '+') data.mem = this.msfIncr(data.mem, 256);
        else if (chr === '.') data.out += String.fromCharCode(data.mem);
    },

    msf: function(input) {
        const data = { mem: 0, out: '' };
        [...input].forEach(elt => this.msfEval(data, elt));
        return data.out;
    }
};

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> deadfish('iissso')
[ 0 ]
> deadfish('diissisdo')
[ 288 ]
> deadfish('iiisdoso')
[ 8, 64 ]

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const deadfish = (p, v=0) => {
    const out = [];
    const reset = () => (v === 256 || v < 0) ? v = 0 : null;
    const parse = {
        'i': () => v++,
        'd': () => v--,
        's': () => v *= v,
        'o': () => out.push(v)
    };
    const interpret = f => {
        f(v);
        reset();
    };
    for (const cmd of [...p].map(char => parse[char])) {
        interpret(cmd);
    }
    return out;
};