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How can I check for “undefined” in JavaScript? [duplicate]

...n window; // true "theFoo" in window; // false If you are interested in knowing whether the variable hasn't been declared or has the value undefined, then use the typeof operator, which is guaranteed to return a string: if (typeof myVar !== 'undefined') Direct comparisons against undefined are ...
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force client disconnect from server with socket.io and nodejs

... Edit: This is now possible You can now simply call socket.disconnect() on the server side. My original answer: This is not possible yet. If you need it as well, vote/comment on this issue. ...
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When do items in HTML5 local storage expire?

...parse(localStorage.getItem("key")), dateString = object.timestamp, now = new Date().getTime().toString(); compareTime(dateString, now); //to implement share | improve this answer ...
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Pushing an existing Git repository to SVN

...ository, using dcommit. That's all. Keeping repositories in sync You can now synchronise from SVN to Git, using the following commands: git svn fetch git rebase trunk And to synchronise from Git to SVN, use: git svn dcommit Final note You might want to try this out on a local copy, before a...
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How does `is_base_of` work?

...tness anymore. In an ordinary overload resolution scenario, the call would now be ambiguous because normally the return type won't participate in overload resolution. For conversion functions, however, there is a backdoor. If two conversion functions are equally good, then the return type of them de...
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How to undo “git commit --amend” done instead of “git commit”

...happens on top of a different commit from where the current branch head is now. # Move the current head so that it's pointing at the old commit # Leave the index intact for redoing the commit. # HEAD@{1} gives you "the commit that HEAD pointed at before # it was moved to where it currently point...
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Why do we use __init__ in Python classes?

...bute", as opposed to "instance attributes" that are colour or legs above. Now, to something less canine and more programming-related. As I write below, class to add things is not sensible - what is it a class of? Classes in Python make up of collections of different data, that behave similarly. Cla...
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How to insert a SQLite record with a datetime set to 'now' in Android application?

...a couple options you can use: You could try using the string "(DATETIME('now'))" instead. Insert the datetime yourself, ie with System.currentTimeMillis() When creating the SQLite table, specify a default value for the created_date column as the current date time. Use SQLiteDatabase.execSQL to ins...
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mongodb: insert if not exists

... specify what data you want to write: data = {"$set":{"key2":"value2"}} Now your selected document will update the value of "key2" only and leave everything else untouched. share | improve this...
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How to have an automatic timestamp in SQLite?

...rged your answer and javed's. With DEFAULT (STRFTIME('%Y-%m-%d %H:%M:%f', 'NOW', 'localtime')) one actually gets meaningful microsecond values. – Dietmar Jun 22 '17 at 18:24 ...