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Determining type of an object in ruby
...be particular about the type.
For example, object.is_a?(String) is too rigid since another class might implement methods that convert it into a string, or make it behave identically to how String behaves. object.respond_to?(:to_s) would be a better way to test that the object in question does what ...
Using do block vs braces {}
...he bracket syntax
has a higher precedence than the
do..end syntax. Consider the following
two snippets of code:
1.upto 3 do |x|
puts x
end
1.upto 3 { |x| puts x }
# SyntaxError: compile error
Second example only works when parentheses is used, 1.upto(3) { |x| puts x }
...
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...forms can get hard to read (and therefore hard to maintain). This page provides a good introduction to quoting in Bash.
Arrays ($var vs. $var[@] vs. ${var[@]})
Now for your array. According to the bash manual:
Referencing an array variable without a subscript is equivalent to referencing the a...
What is the difference between named and positional parameters in Dart?
...n flags or out-of-context numbers.
Checking if optional parameter was provided
Unfortunately, you cannot distinguish between the cases "an optional parameter was not provided" and "an optional parameter was provided with the default value".
Note: You may use positional optional parameters or name...
What are some examples of commonly used practices for naming git branches? [closed]
...e parts of your branch names.
Do not use bare numbers as leading parts.
Avoid long descriptive names for long-lived branches.
Group tokens
Use "grouping" tokens in front of your branch names.
group1/foo
group2/foo
group1/bar
group2/bar
group3/bar
group1/baz
The groups can be named whatever yo...
Is there any way to use a numeric type as an object key?
...OwnProperty("1") yields true. Semantically, this property can also be considered an "element" by virtue of having a numeric key, but there is nothing further that distinguishes an array "element" from an array property. Read the spec. If you still disagree, kindly cite your source.
...
How do I get an HttpContext object from HttpContextBase in ASP.NET MVC 1?
...ne to modify) that is expecting the context to be typed as HttpContext.
void Foo(HttpContextBase context)
{
var app = (HttpApplication) context.GetService(typeof(HttpApplication));
ThirdParty.Bar.Baz(app.Context);
}
// Somewhere in assembly and namespace ThirdParty,
// in a class called B...
what does -webkit-transform: translate3d(0,0,0); exactly do? Apply to body?
...it have any performance issues? Should I just apply it to the body or individual elements? It seems to improve scroll events drastically.
...
Java FileReader encoding issue
...leReader always use the platform default encoding which is generally a bad idea.
Since Java 11 FileReader has also gained constructors that accept an encoding: new FileReader(file, charset) and new FileReader(fileName, charset).
In earlier versions of java, you need to use new InputStreamReader(ne...
How to overload the operator++ in two different ways for postfix a++ and prefix ++a?
...ric: You have it correct all the way through apart from a sentence in the middle where you mix. Its prefix that is better.
– Martin York
Oct 2 '10 at 19:10
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