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How to create a file in Ruby
...ile.
If the text to be output is a string, rather than write:
File.open('foo.txt', 'w') { |fo| fo.puts "bar" }
or worse:
fo = File.open('foo.txt', 'w')
fo.puts "bar"
fo.close
Use the more succinct write:
File.write('foo.txt', 'bar')
write has modes allowed so we can use 'w', 'a', 'r+' if n...
Ruby replace string with captured regex pattern
...ement (single quotes are important, otherwise you need to escape the \):
"foo".gsub(/(o+)/, '\1\1\1')
#=> "foooooo"
But since you only seem to be interested in the capture group, note that you can index a string with a regex:
"foo"[/oo/]
#=> "oo"
"Z_123: foobar"[/^Z_.*(?=:)/]
#=> "Z_123...
Check if a string is html or not
...f a string is HTML is:
/^/
For example:
/^/.test('') // true
/^/.test('foo bar baz') //true
/^/.test('<p>fizz buzz</p>') //true
In fact, it's so good, that it'll return true for every string passed to it, which is because every string is HTML. Seriously, even if it's poorly formatt...
How to Deserialize XML document
..., and use xsd to generate C# classes?
Write the file to disk (I named it foo.xml)
Generate the xsd: xsd foo.xml
Generate the C#: xsd foo.xsd /classes
Et voila - and C# code file that should be able to read the data via XmlSerializer:
XmlSerializer ser = new XmlSerializer(typeof(Cars));
...
Get the data received in a Flask request
... flask import Flask, request, jsonify
app = Flask(__name__)
@app.route('/foo', methods=['POST'])
def foo():
data = request.json
return jsonify(data)
To post JSON with curl:
curl -i -H "Content-Type: application/json" -X POST -d '{"userId":"1", "username": "fizz bizz"}' http://localhost...
The constant cannot be marked static
... public static readonly field.
Lib.dll, provided as binary:
public class Foo {
public const int HATS = 42;
public static readonly int GLOVES = 33;
}
App.exe, references Lib.dll:
Foo.HATS // This will always be 42 even if the value in Lib.dll changes,
// unless App.exe is ...
Should I pass an std::function by const-reference?
...argument into a variable (typically a member variable of a class):
struct Foo {
Foo(Object o) : m_o(std::move(o)) {}
Object m_o;
};
When you know your function will move its argument, this is the best solution, this way your users can control how they call your function:
Foo f1{Object()...
How do I modify fields inside the new PostgreSQL JSON datatype?
...n$;
Usage examples:
s1=# SELECT json_object_del_key ('{"hello":[7,3,1],"foo":{"mofu":"fuwa", "moe":"kyun"}}',
'foo'),
json_object_del_path('{"hello":[7,3,1],"foo":{"mofu":"fuwa", "moe":"kyun"}}',
'{"foo","moe"}');
jso...
How to paste yanked text into the Vim command line
...he contents of the 58th line.
Define a search pattern manually: :let @/ = 'foo'
cf. :help :let
Note that doing that, you needn't to escape / in the pattern. However you need to double all single quotes of course.
Copy all lines beginning with foo, and afterwards all lines containing bar to clipboa...
Enforcing the type of the indexed members of a Typescript object?
...eys like x[''] = 'empty string';, x['000'] = 'threezeros'; x[undefined] = 'foo'.
– robocat
Feb 4 '19 at 23:54
...