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What is the difference between null and undefined in JavaScript?

...t while this comment was true in '11, with the advent of optional function params, emergence of type-checking systems like Flow, and pervasiveness of React (all of which treat undefined and null very differently), the old wisdom of generally using null rather than undefined no longer holds so strict...
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Do we still need end slashes in HTML5?

... area, base, br, col, command, embed, hr, img, input, keygen, link, meta, param, source, track, wbr ... Void elements only have a start tag; end tags must not be specified for void elements. W3C | WHATWG That being said it's not strict parsing in HTML5 so it won't do any major harm. ...
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How do I use disk caching in Picasso?

...soInstance = null; /** * PicassoCache Constructor * * @param context application Context */ private PicassoCache (Context context) { Downloader downloader = new OkHttpDownloader(context, Integer.MAX_VALUE); Picasso.Builder builder = new Picasso.Builder...
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What does it mean to start a PHP function with an ampersand?

...ntiated) something like $results = $facebook->users_hasAppPermission($param1, $param2); ? I guess I'm not sure of the nuance here, thanks for the help though. – Alex Mcp Nov 4 '09 at 21:56 ...
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Is there a way to make ellipsize=“marquee” always scroll?

... Just put these parameters in your TextView. It works :) android:singleLine="true" android:ellipsize="marquee" android:marqueeRepeatLimit ="marquee_forever" android:scrollHorizontally="true" android:focusable="true" ...
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android asynctask sending callbacks to ui [duplicate]

...tructor } @Override protected Object doInBackground(Object... params) { //My Background tasks are written here return {resutl Object} } @Override protected void onPostExecute(Object result) { delegate.processFinish(result); } } Then Called the as...
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Show/hide 'div' using JavaScript

...'.target'); show(elements); show(elements, 'inline-block'); // The second param allows you to specify a display value var elements = document.querySelectorAll('.target'); show(elements, 'inline-block'); // The second param allows you to specify a display value show(document.getElementBy...
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Is there a better alternative than this to 'switch on type'?

...t> Action { get; set; } } public static void Do(object source, params CaseInfo[] cases) { var type = source.GetType(); foreach (var entry in cases) { if (entry.IsDefault || entry.Target.IsAssignableFrom(type)) { entry.Action(source); ...
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Getting “A potentially dangerous Request.Path value was detected from the client (&)”

...ault", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Home", action = "Index", id = UrlParameter.Optional }, new string[] { "RPMS.Controllers" } // Parameter defaults ); ...
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Cannot pass null argument when using type hinting

... declaration can be made to accept NULL values if the default value of the parameter is set to NULL. share | improve this answer | follow | ...