performance - Javascript variables and memory leaking? -
is possible create memory leaks when coding in javascript? , if dependent on javascript rendering engine e.g. v8 or ie's chakra
i seem getting slow performance when iterating through large loop constructs.
should "delete" variables im not using?
var myvar = 'very long string'; delete myvar;
in example you've shown, unless myvar in global scope garbage collected @ end of function.
in general, don't need worry memory in javascript. need worry memory when unintentionally create references objects , forget them. example:
function buttonclick() { var clicked = false; document.body.addeventlistener('click', function(event) { if (clicked) return; if (event.target.nodename !== 'button') return; clicked = foo(); }, true); } the above code bad code begin (not cleaning event listeners), illustrates example of "memory leak" in javascript. when buttonclick() called, binds function click event on <body>. because removeeventlistener never called unbind listener, memory used function never reclaimed. means every time buttonclick() called, little bit of memory "leak".
even then, however, amount of memory leaked quite small , won't ever become problem vast majority of use cases. problem in server-side javascript, code potentially run more , process stays alive longer.
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