Interpret

Interpret2.js

"use strict";
const fns = {
    gt: (a, b) => a > b,
    lt: (a, b) => a < b,
    eq: (a, b) => a === b,
    add: (a, b) => a + b,
    sub: (a, b) => a - b,
    mul: (a, b) => a * b,
    div: (a, b) => a / b,
    if: (cond, a, b) => (cond ? a : b),
  };
  
function interpret2(pgm) {
    let isArray = Array.isArray(pgm);
    if (isArray) {
        let [fn, ...args] = pgm;
        let values = args.map(interpret2);
        return fns[fn](...values);
    } else {
        return pgm;
    }
}

(async () => {
    let isFifteenDivisibleByThreeProgram = [
        "if",
        ["eq", 0, ["div", 15, 3]],
        true,
        false
    ];
    console.log(interpret2(isFifteenDivisibleByThreeProgram));
    
    const shutdown = (signal) => async () => {
        process.exit(0);
    };
    process
        .on('SIGINT', shutdown('SIGINT'))
        .on('SIGTERM', shutdown('SIGTERM'))
        .on('uncaughtException', shutdown('uncaughtException'));
})();