martinwells

window.performance.memory.totalJSHeapSize;	// currently used heap memory
window.performance.memory.usedJSHeapSize;	// total heap memory

martinwells

chrome --enable-memory-info

martinwells

do shell script 
  "\"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\"     
      --enable-memory-info"

martinwells

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;

martinwells

var newObject = new MyObject();

martinwells

var s = { data: 'test' };
s.data = null; 	// not required
s = null;		// this will automatically clear s.data as well

martinwells

var m = 'test';
m = null;
m === 'test'; // false

martinwells

var m = 'test';
delete m; // silently returns false (not allowed)
m === 'test'; // true - oops, still a value

martinwells

var s = { data: 'test' };
delete s.data;

martinwells

// var b = null; // commented out now

function test()
{
    var str = 'A string I am';
    b = str; // oops, no var keyword means this is a global 
}
    
test();