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Using the Swift if let with logical AND operator &&
...
It is not possible.
From Swift grammar
GRAMMAR OF AN IF STATEMENT
if-statement → if if-condition code-block else-clauseopt
if-condition → expression | declaration
else-clause → else code-block | else...
What is resource-ref in web.xml used for?
...esources in the web.xml has the advantage of separating the developer role from the deployer role. In other words, as a developer, you don't have to know what your required resources are actually called in production, and as the guy deploying the application, you will have a nice list of names to ma...
When to use static classes in C# [duplicate]
...ndards, standards, standards!
Using instance methods does not inhibit you from also using static methods, and vice versa. As long as there's reasoning behind the differentiation and it's standardised. There's nothing worse than looking over a business layer sprawling with different implementation m...
How do I include related model fields using Django Rest Framework?
...o allows you to specify deep nested relationships by using dot notation.
from rest_flex_fields import FlexFieldsModelSerializer
class ClassroomSerializer(FlexFieldsModelSerializer):
class Meta:
model = Model
fields = ("teacher_set",)
expandable_fields = {"teacher_set":...
regex for zip-code
...tion I made that was helpful for one of my projects.
In a previous answer from @kennytm:
^\d{5}(?:[-\s]\d{4})?$
…? = The pattern before it is optional (for condition 1)
If you want to allow both standard 5 digit and +4 zip codes, this is a great example.
To match only zip codes in the US...
How do I increase the RAM and set up host-only networking in Vagrant?
... ]
You can obtain the properties that you want to change from the documents for VirtualBox command-line options:
http://www.virtualbox.org/manual/ch08.html#vboxmanage-modifyvm
The vagrant documentation has the section on how to change IP address:
Vagrant::Config.run do |config...
Why is MySQL's default collation latin1_swedish_ci?
...swedish. However, the accepted answer seems a more plausible explanation, from a social perspective, for why swedish was chosen in particular.
– Alan
Jul 21 '11 at 19:30
2
...
Using System.Dynamic in Roslyn
...ees: new[] {tree},
references: new[] {
MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
MetadataReference.CreateFromFile(typeof(ExpandoObject).Assembly.Location),
MetadataReference.CreateFromFile(Assembly.Load(new AssemblyName("Microsoft.CSharp")).Locat...
React.js: Identifying different inputs with one onChange handler
...
Deprecated solution
valueLink/checkedLink are deprecated from core React, because it is confusing some users. This answer won't work if you use a recent version of React. But if you like it, you can easily emulate it by creating your own Input component
Old answer content:
What y...
Where to define custom error types in Ruby and/or Rails?
...you might have to also include the exception file. See this example, again from httparty: github.com/jnunemaker/httparty/blob/…
– Jason Swett
Apr 15 '14 at 20:05
37
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