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Swift variable decorations with “?” (question mark) and “!” (exclamation mark)
... important difference that if you don't check for nil you'll get a runtime error)
// Cannot be nil
var x: Int = 1
// The type here is not "Int", it's "Optional Int"
var y: Int? = 2
// The type here is "Implicitly Unwrapped Optional Int"
var z: Int! = 3
Usage:
// you can add x and z
x + z == 4
...
Maven Could not resolve dependencies, artifacts could not be resolved
...
His first artifact error is a provided jar com.springsource.javax.servlet. If it's provided why would it have anything to do with setting.xml?
– Philip Rego
Jan 15 '19 at 18:29
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Chrome says “Resource interpreted as script but transferred with MIME type text/plain.”, what gives?
...n servers such as Weblogic
1) Make sure your weblogic.xml file is free of errors
like this one:
<?xml version = '1.0' encoding = 'windows-1252'?>
<weblogic-web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.bea.com/ns/weblog...
Slow Requests on Local Flask Server
...m my use of PyCharm, the line from meinheld import server highlights as an error, but the server will run, so you can ignore the error.
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Qt 5.1.1: Application failed to start because platform plugin “windows” is missing
...pends and its profiling mode (F7). After the app has started and shown the error, libEGL.dll appeared in the dependencies list.
– lapis
Sep 24 '14 at 9:49
17
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Efficient way to determine number of digits in an integer
... for all relevant k. That is is it guaranteed that any inevitable rounding error goes in the right direction. k + eps as a result works, k - eps doesn't. And "Perfectly precise" is naïve.
– gnasher729
Aug 1 '15 at 8:26
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Commenting in a Bash script inside a multiline command
...re that '__' remains unset
scat <<EOF # else exit with an error
Error: the parameter __='${__}' is set, hence the
comment-idiom '\${__+ <comment text>}' will fail
EOF
${__+ (example of inline comments)
------------------------------------------------
the following inline co...
Razor ViewEngine: How do I escape the “@” symbol?
... <a href="" title="this @@ won't work"></a>, both syntax error in VS and parser error in runtime.
– Tien Do
Jul 25 '12 at 1:35
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Can't start Eclipse - Java was started but returned exit code=13
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I got this error and found that my PATH variable (on Windows) was probably changed. First in my PATH was this entry:
C:\ProgramData\Oracle\Java\javapath
...and Eclipse ran "C:\ProgramData\Oracle\Java\javapath\javaw" - which gave the ...
Interface type check with Typescript
...'bar';
barProperty: number;
}
let object: Foo | Bar;
// You will see errors if `strictNullChecks` is enabled.
if (object.type === 'foo') {
// object has type `Foo`.
object.fooProperty;
} else {
// object has type `Bar`.
object.barProperty;
}
And it works with switch too.
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