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Difference between sh and bash
...-argument for((i=0;i<=3;i++)) loop, += increment assignment, etc. The $'string\nwith\tC\aescapes' feature is tentatively accepted for POSIX (meaning it works in Bash now, but will not yet be supported by sh on systems which only adhere to the current POSIX specification, and likely will not for s...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
...w 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 will "helpfully" throw an ArrayStoreException at runtime. Scala...
Differences between ExpandoObject, DynamicObject and dynamic
...class MyNoCookiesInTheJarDynamicObject : DynamicObject
{
Dictionary<string, object> properties = new Dictionary<string, object>();
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
if (properties.ContainsKey(binder.Name))
{
...
How to tell if a file is git tracked (by shell exit code)?
...in a script, for example PowerShell:
$gitResult = (git ls-files $_) | out-string
if ($gitResult.length -ne 0)
{
## do stuff with the tracked file
}
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Change one value based on another value in pandas
...her columns by using the + operation which is overridden for series. Fancy string formatting, f-strings etc won't work here since the + applies to scalars and not 'primitive' values:
df['description'] = 'A ' + df.age.astype(str) + ' years old ' \
+ df.type + ' ' + df.animal
In ...
Is it better to use Enumerable.Empty() as opposed to new List() to initialize an IEnumerable
...ing it to a new list in the constructor:
public class Person
{
public string Name { get; set; }
public IList<Role> Roles { get; private set; }
public Person()
{
Roles = new List<Role>();
}
}
If you really really want to have the public setter, leave Roles ...
When to use DataContract and DataMember attributes?
...to and from XML). All .NET Framework primitive types, such as integers and strings, as well as certain types treated as primitives, such as DateTime and XmlElement, can be serialized with no other preparation and are considered as having default data contracts. Many .NET Framework types also have ex...
Creating and throwing new exception
...und."
}
To throw a general exception use the throw command followed by a string.
throw "Error trying to do a task"
When used inside a catch, you can provide additional information about what triggered the error
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jQuery hasAttr checking to see if there is an attribute on an element [duplicate]
...
if the name attr is present but empty string, the attribute would exist but the test would fail.
– lambacck
Jun 12 '10 at 4:01
7
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What is the perfect counterpart in Python for “while not EOF”
...iteration stops when openfileobject.read(1024) starts returning empty byte strings.
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