The KeyboardEvent.code property represents a physical key on the keyboard (as opposed to the character generated by pressing the key). In other words, this property returns a value that isn't altered by keyboard layout or the state of the modifier keys.

This property is useful when you want to handle keys based on their physical positions on the input device rather than the characters associated with those keys; this is especially common when writing code to handle input for games that simulate a gamepad-like environment using keys on the keyboard. Be aware, however, that you can't use the value reported by KeyboardEvent.code to determine the character generated by the keystroke, because the keycode's name may not match the actual character that's printed on the key or that's generated by the computer when the key is pressed.


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For example, the code returned is "KeyQ" for the Q key on a QWERTY layout keyboard, but the same code value also represents the ' key on Dvorak keyboards and the A key on AZERTY keyboards. That makes it impossible to use the value of code to determine what the name of the key is to users if they're not using an anticipated keyboard layout.

The first section of the JavaScript code establishes some variables we'll be using. shipSize contains the size of the ship the player is moving around, for convenience. position is used to track the position of the ship within the play field. moveRate is the number of pixels each keystroke moves the ship forward and backward, and turnRate is how many degrees of rotation the left and right steering controls apply per keystroke. angle is the current amount of rotation applied to the ship in degrees; it starts at 0 (pointing straight up). Finally, spaceship is set to refer to the element with the ID "spaceship", which is the SVG polygon representing the ship the player controls.

There are several ways this code can be made better. Most real games would watch for keydown events, start motion when that happens, and stop the motion when the corresponding keyup occurs, instead of relying on key repeats. That would allow both smoother and faster movement, but would also allow the player to be moving and steering at the same time. Transitions or animations could be used to make the ship's movement smoother, too.

For example, the code returned is \"KeyQ\" for the Q key on a QWERTY layout keyboard, but the same code value also represents the ' key on Dvorak keyboards and the A key on AZERTY keyboards. That makes it impossible to use the value of code to determine what the name of the key is to users if they're not using an anticipated keyboard layout.

The first section of the JavaScript code establishes some variables we'll be using. shipSize contains the size of the ship the player is moving around, for convenience. position is used to track the position of the ship within the play field. moveRate is the number of pixels each keystroke moves the ship forward and backward, and turnRate is how many degrees of rotation the left and right steering controls apply per keystroke. angle is the current amount of rotation applied to the ship in degrees; it starts at 0 (pointing straight up). Finally, spaceship is set to refer to the element with the ID \"spaceship\", which is the SVG polygon representing the ship the player controls.

When code fails, it often gives an error message. If your software is any good, that error message will say exactly what was wrong and point you in the direction of a fix. Previous self-healing code programs are clever automations that reduce errors, allow for graceful fallbacks, and manage alerts. Maybe you want to add a little disk space or delete some files when you get a warning that utilization is at 90% percent. Or hey, have you tried turning it off and then back on again?

Developers love automating solutions to their problems, and with the rise of generative AI, this concept is likely to be applied to both the creation, maintenance, and the improvement of code at an entirely new level.

Itamar Friedman, CEO of CodiumAI, currently approaches the problem while code is being written. His company has an AI bot that works as a pair programmer alongside developers, prompting them with tests that fail, pointing out edge cases, and generally poking holes in their code as they write, aiming to ensure that the finished product is as bug free as possible. He says a lot of tools for measuring code quality focus on aspects like performance, readability, and avoiding repetition.

The Delaware Code appearing on this site is prepared by the Delaware Code Revisors and the editorial staff of LexisNexis in cooperation with the Division of Research of Legislative Council of the General Assembly, and is considered an official version of the State of Delaware statutory code. This version includes all acts enacted as of October 18, 2023, up to and including 84 Del. Laws, c. 240.

The snippet editor includes fields for a name, a visual editor-enabled description, tags to allow you to categorize snippets, and a full-featured code editor. Snippets can be exported for transfer to another site, either in JSON for later importing by the Code Snippets plugin, or in PHP for creating your own plugin or theme.

You can report security bugs found in the source code of this plugin through the Patchstack Vulnerability Disclosure Program. The Patchstack team will assist with verification, triage, and notification of security vulnerabilities.

The process of encoding converts information from a source into symbols for communication or storage. Decoding is the reverse process, converting code symbols back into a form that the recipient understands, such as English or/and Spanish.

One reason for coding is to enable communication in places where ordinary plain language, spoken or written, is difficult or impossible. For example, semaphore, where the configuration of flags held by a signaler or the arms of a semaphore tower encodes parts of the message, typically individual letters, and numbers. Another person standing a great distance away can interpret the flags and reproduce the words sent.

In information theory and computer science, a code is usually considered as an algorithm that uniquely represents symbols from some source alphabet, by encoded strings, which may be in some other target alphabet. An extension of the code for representing sequences of symbols over the source alphabet is obtained by concatenating the encoded strings.

In this section, we consider codes that encode each source (clear text) character by a code word from some dictionary, and concatenation of such code words give us an encoded string. Variable-length codes are especially useful when clear text characters have different probabilities; see also entropy encoding.

A prefix code is a code with the "prefix property": there is no valid code word in the system that is a prefix (start) of any other valid code word in the set. Huffman coding is the most known algorithm for deriving prefix codes. Prefix codes are widely referred to as "Huffman codes" even when the code was not produced by a Huffman algorithm. Other examples of prefix codes are country calling codes, the country and publisher parts of ISBNs, and the Secondary Synchronization Codes used in the UMTS WCDMA 3G Wireless Standard.

Kraft's inequality characterizes the sets of codeword lengths that are possible in a prefix code. Virtually any uniquely decodable one-to-many code, not necessarily a prefix one, must satisfy Kraft's inequality.

Codes can be used for brevity. When telegraph messages were the state of the art in rapid long-distance communication, elaborate systems of commercial codes that encoded complete phrases into single mouths (commonly five-minute groups) were developed, so that telegraphers became conversant with such "words" as BYOXO ("Are you trying to weasel out of our deal?"), LIOUY ("Why do you not answer my question?"), BMULD ("You're a skunk!"), or AYYLU ("Not clearly coded, repeat more clearly."). Code words were chosen for various reasons: length, pronounceability, etc. Meanings were chosen to fit perceived needs: commercial negotiations, military terms for military codes, diplomatic terms for diplomatic codes, any and all of the preceding for espionage codes. Codebooks and codebook publishers proliferated, including one run as a front for the American Black Chamber run by Herbert Yardley between the First and Second World Wars. The purpose of most of these codes was to save on cable costs. The use of data coding for data compression predates the computer era; an early example is the telegraph Morse code where more-frequently used characters have shorter representations. Techniques such as Huffman coding are now used by computer-based algorithms to compress large data files into a more compact form for storage or transmission. e24fc04721

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