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var lastUsedHeap = 0; // remember the heap size
function checkMemory()
// check if the heap size is this cycle is LESS than what we had last
// cycle; if so, then the garbage collector has kicked in
if (window.performance.memory.usedJSHeapSize < lastUsedHeap)
console.log('Garbage collected!');
lastUsedHeap = window.performance.memory.usedJSHeapSize;
setTimeout(checkMemory, 100); // test 10 times per second

Shouldn't setTimeout be setInterval?

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