logMemory.js

function logMemory() {
    if (typeof process != 'undefined') {
        console.log(`Node: ${process.memoryUsage().heapUsed / Math.pow(1000, 2)} MB`);
    } else if (performance) {
        console.log(`Browser: ${performance.memory.usedJSHeapSize / Math.pow(1000, 2)} MB`);
    } else {
        throw ('Where d-heck are you trying to run me?');
    }
}

function measureMemory() {
    const arraySize = 25 * Math.pow(1000, 2);
    logMemory();
    (function() {
        const array1 = new Array(arraySize).fill(1.1);
    logMemory();
    })();
    (function() {
        const array2 = new Array(arraySize).fill(1);
    logMemory()
    })();
    
    setTimeout(() => {
        logMemory();
    }, 5000);
}

measureMemory();