javascript - Memory impact of assigning a new value to global variable -


what happens when global variables reassigned new values - old memory safely released or leaked?

for example, 

gui = {};  function myfunc1() {    gui.selecteditem = new bigarray(1000); } function myfunc2() {    gui.selecteditem = new bigarray(1000); } function release() {    gui.selecteditem = null; }

would safe call myfunc1() , myfunc2() 1 after other immediately, or assign variable null first (before reassigning large object)?

i purely interested in memory pressure , concerned variable leaking old memory when new value assigned new.

javascript uses garbage collector reclaim memory of objects not accessible variables. old memory released automatically.


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