Hari 21: Performance & Optimisasi

Memoization — Cache Hasil Komputasi

function memoize(fn) {
    const cache = new Map();
    return function(...args) {
        const key = JSON.stringify(args);
        if (cache.has(key)) {
            console.log(`Cache hit: ${key}`);
            return cache.get(key);
        }
        const result = fn.apply(this, args);
        cache.set(key, result);
        return result;
    };
}

const fibonacci = memoize(function fib(n) {
    if (n <= 1) return n;
    return fibonacci(n - 1) + fibonacci(n - 2);
});

console.log(fibonacci(10)); // 55 (cepat berkat memoization)
console.log(fibonacci(10)); // Cache hit: [10]

Debounce & Throttle

// Debounce — tunda eksekusi, reset jika dipanggil lagi
function debounce(fn, delay) {
    let timer;
    return (...args) => {
        clearTimeout(timer);
        timer = setTimeout(() => fn(...args), delay);
    };
}

// Throttle — batasi frekuensi eksekusi
function throttle(fn, limit) {
    let inThrottle = false;
    return (...args) => {
        if (!inThrottle) {
            fn(...args);
            inThrottle = true;
            setTimeout(() => inThrottle = false, limit);
        }
    };
}