Memoization helper

memoize.js

/**
 * Memoization helper.
 * @param fn
 * @param context
 * @return Function
 */
export default function memoize(fn, context = null) {
    const cache = {};
    
    return (...args) => {
        const key = JSON.stringify(args);
        
        if (typeof cache[key] === 'undefined') {
            if (fn === null || typeof fn === 'number' || typeof fn === 'undefined' || typeof fn.call === 'undefined') {
                cache[key] = fn;
            } else {
                cache[key] = fn.call(context, ...args);
            }
        }
        
        return cache[key];
    };
}