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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.
A very common example is failing to close files that have been opened, which leaks a file handle; this also occurs with pipes. Another common example is a parent process failing to call wait on a child process , which leaves the completed child process as a zombie process , leaking a process table entry.
The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output .
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.
A re-introduction to JavaScript (JS tutorial) – when you are ready for a second go. Basic JavaScript – freeCodeCamp's 10-hour JavaScript learning track; The Modern JavaScript Tutorial – from beginning to advanced. Introduction to Object-Oriented JavaScript – from the Mozilla Developer Network; JavaScript Tutorial – from w3schools.com
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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).
A JavaScript engine is a software component that executes JavaScript code. The first JavaScript engines were mere interpreters, but all relevant modern engines use just-in-time compilation for improved performance. [1] JavaScript engines are typically developed by web browser vendors, and every major browser has one