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A handle leak is a type of software bug that occurs when a computer program asks for a handle to a resource but does not free the handle when it is no longer used. [1] If this occurs frequently or repeatedly over an extended period of time, a large number of handles may be marked in-use and thus unavailable, causing performance problems or a crash.
Many resource leaks are fixed by resource reclamation by the operating system after the process terminates and makes an exit system call. Resource leaks are thus primarily a problem for long-lived processes, as leaked resources held by still-running processes are often not reclaimed; and for processes that rapidly acquire and leak many resources.
Event bubbling is a type of DOM event propagation [1] where the event first triggers on the innermost target element, and then successively triggers on the ancestors (parents) of the target element in the same nesting hierarchy till it reaches the outermost DOM element or document object [2] (Provided the handler is initialized).
Typically the handle is an index or a pointer into a global array of tombstones. A handle leak is a type of software bug that occurs when a computer program does not free a handle that it previously allocated. This is a form of resource leak, analogous to a memory leak for previously allocated memory.
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
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JavaScript Garden – collection of tips and documentation on JavaScript's quirks; JavaScript Guide – programmer's manual, from the Mozilla Developer Network; JavaScript reference – describes the language in detail. From the Mozilla Developer Network. JavaScript WikiBook – community-written introductory-level book on JavaScript, from ...
These are typically built into browsers, in their DevTools window. Debuggers allow you to step debug (go through your JavaScript code line-by-line, hover over variables to see their values, etc.) Firefox - use Tools → JavaScript Console showing all JavaScript and CSS errors. Chrome and Edge - use Tools → Developer Tools.