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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]

... 'I have a class which is created when the user clicks a button. Before this the class is undefined, it doesn't exist anywhere so how can I compare it? - that was a question. – Thevs Jun 22 '15 at 5:36 ...
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Eclipse does not highlight matching variables

...o see occurrences of then disable and re-enable the Mark Occurences Toggle button. share | improve this answer | follow | ...
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IntelliJ not recognizing a particular file correctly, instead its stuck as a text file

...Then in the Sources tab, select the "java" folder and press on the Sources button. That tells IntelliJ that the folder in question is a source code folder. Then select the Test folder and press Tests. That's it. Then it will recognize correctly the files and show errors as needed. See below th...
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How do you create a hidden div that doesn't create a line break or horizontal space?

... I need to hide me alert msg on page load and wanted to show it again on button click. Tried visibility: hidden but that was showing empty space. style="display: none;" worked like a little charm :) – sohaiby Apr 27 '15 at 12:00 ...
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How to delete/create databases in Neo4j?

...e browse option and choose a different directory and click start button. New database created on that direcory share | improve this answer | follow ...
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Android: open activity without save into the stack

...e to launch another Activity( let say third Activity), a press to the back button in the third Activity will return to the main Activity and not the list Activity – VinceFR Sep 10 '12 at 20:04 ...
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Restore LogCat window within Android Studio

...if you have hidden it... Use Alt+6 to bring up the window and click on the button shown below 'Restore logcat view' share | improve this answer | follow | ...
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Xcode 5 - “iOS Simulator failed to install application” every time I switch simulators

...screen, click and hold the application icon, then tap the hovering “X” button to delete the application. 13917023 Another release note: iOS Simulator If an iOS app is detached, relaunching the same app from Xcode will result in a black screen in the Simulator even though the n...
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AWS: How to disable all services?

...re 3 possible ways to achieve this: To have a single turn-off-everything button, but I'm not sure if this exists. Overkill, go through the services and check them one by one and shutdown/delete any instances or running services. To find out the actual source of leaking (cost occurring services) ...
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How to scroll to specific item using jQuery?

.... No need for any plugins. Check out my gist: // Replace #fromA with your button/control and #toB with the target to which // You wanna scroll to. // $("#fromA").click(function() { $("html, body").animate({ scrollTop: $("#toB").offset().top }, 1500); }); ...