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How to force JS to do math instead of putting two strings together

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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?

...Java arrays (which are erroneously covariant): Object[] arr = new Integer[1]; arr[0] = "Hello, there!"; We just assigned a value of type String to an array of type Integer[]. For reasons which should be obvious, this is bad news. Java's type system actually allows this at compile time. The JVM...
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Showing a different background colour in Vim past 80 characters

...only actual content that goes over the 80 character mark. I want to have a 100+ column Vim window open with the leftmost 80 columns using the normal background and anything past that using a slightly different background. The Vim window background should be a different color, not just text that goes...
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Maven in Eclipse: step by step installation [closed]

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A Task's exception(s) were not observed either by Waiting on the Task or accessing its Exception pro

... 158 If you create a Task, and you don't ever call task.Wait() or try to retrieve the result of a T...
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Can I Set “android:layout_below” at Runtime Programmatically?

... | edited Sep 15 '17 at 7:21 Pankaj Lilan 3,40211 gold badge2424 silver badges4242 bronze badges ...
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Git merge errors

... | edited May 23 '17 at 12:02 Community♦ 111 silver badge answered May 15 '11 at 7:23 ...
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Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)

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Can an angular directive pass arguments to functions in expressions specified in the directive's att

... 216 If you declare your callback as mentioned by @lex82 like callback = "callback(item.id, arg2)" ...
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Check if class already assigned before adding

... 180 Just call addClass(). jQuery will do the check for you. If you check on your own, you are dou...