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Using the Swift if let with logical AND operator &&
...onstruct
can now unwrap multiple optionals at once, as well as include
intervening boolean conditions. This lets you express conditional
control flow without unnecessary nesting.
With the statement above, the syntax would then be:
if let tabBarController = window!.rootViewController as? UIT...
reformat in vim for a nice column layout
...
@metrix, here is a very clumsy workaround: 1) convert spaces inside delimiters into a different character, 2) then run column as described in the post, 3) then replace your delimiters back to spaces. An example command in visual mode for step #1 is: '<,'>s/"\(\w\+\...
Difference between namespace in C# and package in Java
...kage statement.
C#
Namespaces are used to organize programs, both as an "internal" organization system for a program, and as an "external" organization system.
System.Security.Cryptography.AsymmetricAlgorithm aa;
may be replaced:
using System.Security.Crypography;
AsymmetricAlgorithm aa;
Al...
JavaScript variable number of arguments to function
... method concat returns a copy of the 'array' it's called on, we can easily convert the arguments object to a real array like this: var args = [].concat.call(arguments). Some people prefer to use Array.prototype.concat.call instead, but I like the [], they are short and sweet!
–...
Encoding as Base64 in Java
...
You can also convert using Base64 encoding. To do this, you can use the javax.xml.bind.DatatypeConverter#printBase64Binary method.
For example:
byte[] salt = new byte[] { 50, 111, 8, 53, 86, 35, -19, -47 };
System.out.println(DatatypeCo...
Set transparent background of an imageview on Android
...the percentage number by 100 and multiply by 255 to get the decimal value. Convert the decimal to hexadecimal here.
For example, for 50%, 50/100 * 255 = 127. Using the link we get hexadecimal value 7F.
Source: Android: how to create a transparent or opaque background
...
Django template how to look up a dictionary value with a variable
...he function is in the form of a string, so perhaps use ast.literal_eval to convert the string to a dictionary first, like in this example.
With this edit, the code should look like this:
# code for custom template tag
@register.filter(name='lookup')
def lookup(value, arg):
value_dict = ast.liter...
Left-pad printf with spaces
How can I pad a string with spaces on the left when using printf?
4 Answers
4
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How can I recursively find all files in current and subfolders based on wildcard matching?
... image was copied from GitHub, but I believe they're using asciinema, then converted to GIF format, but I'm not sure.
– kenorb
Feb 11 '19 at 23:38
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How to get last N records with activerecord?
...d desc LIMIT 5"
The latter is an unevaluated scope. You can chain it, or convert it to an array via .to_a. So:
Something.limit(50000).order('id desc').count
... takes a second.
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