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How to make a function wait until a callback has been called using node.js

...function should accept a callback parameter that will be invoked when then computation is complete. The caller should not wait for the value to be "returned" in the normal sense, but rather send the routine that will handle the resulting value: function(query, callback) { myApi.exec('SomeCommand'...
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“Conversion to Dalvik format failed with error 1” on external JAR

...ossible reason could be package name conflicts. Suppose you have a package com.abc.xyz and a class named A.java inside this package, and another library project (which is added to the dependency of this project) which contains the same com.abc.xyz.A.java, then you will be getting the exact same erro...
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Creating and Update Laravel Eloquent

...to be updateOrInsert(array $attributes, array $values = []) in 5.5: github.com/laravel/framework/blob/5.5/src/Illuminate/Database/… – user1204214 Jun 23 '18 at 20:56 add a c...
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Can I set an opacity only to the background image of a div?

... I'm super paranoid when it comes to using negative values with z-index.. but, i cant argue with results. Howevveer, i would add width: 100%; height: 100%; to the .bg so that ie6 can spread the bg inside the parent div. jsfiddle.net/sbGb4/2 ...
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Visual C++: How to disable specific linker warnings?

I'm using a library from CGAL which during the linking stage of my code compilation produces a lot of linking warnings of this form: ...
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What is Double Brace initialization in Java?

... of ReallyHeavyObject. You probably don't want to risk that: Image from http://blog.jooq.org/2014/12/08/dont-be-clever-the-double-curly-braces-anti-pattern/ 3. You can pretend that Java has map literals To answer your actual question, people have been using this syntax to pretend that Java has ...
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How do you find all subclasses of a given class in Java?

...e you press the "Display in Type Hierarchy" button (since it is constantly compiling your classes, knows about everything on the classpath, etc). share | improve this answer | ...
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Get the current year in JavaScript

... add a comment  |  233 ...
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Why is using a wild card with a Java import statement bad?

...a Swing app, and so need java.awt.Event, and are also interfacing with the company's calendaring system, which has com.mycompany.calendar.Event. If you import both using the wildcard method, one of these three things happens: You have an outright naming conflict between java.awt.Event and com.myc...
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config.assets.compile=true in Rails production, why not?

...are altered to include the MD5 hash. Sprockets also sets the Cache-Control HTTP header to max-age=31536000. This signals all caches between your server and the client browser that this content (the file served) can be cached for 1 year. The effect of this is to reduce the number of requests for this...