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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...
Initializing multiple variables to the same value in Java
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edited Apr 28 '18 at 0:37
Neuron
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answ...
In Go's http package, how do I get the query string on a POST request?
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147
A QueryString is, by definition, in the URL. You can access the URL of the request using req.U...
An async/await example that causes a deadlock
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81
Take a look at this example, Stephen has a clear answer for you:
So this is what happens, st...
What are type lambdas in Scala and what are their benefits?
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148
Type lambdas are vital quite a bit of the time when you are working with higher-kinded types.
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Postgres: How to do Composite keys?
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175
Your compound PRIMARY KEY specification already does what you want. Omit the line that's givi...
How to use ArgumentCaptor for stubbing?
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edited Mar 15 '18 at 2:21
David Rawson
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How to get a reference to a module inside the module itself?
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218
import sys
current_module = sys.modules[__name__]
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How do I convert an integer to string as part of a PostgreSQL query?
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129
Because the number can be up to 15 digits, you'll meed to cast to an 64 bit (8-byte) integer. ...
How to style a div to be a responsive square? [duplicate]
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190
To achieve what you are looking for you can use the viewport-percentage length vw.
Here is a ...