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How to check if hex color is “too black”?
...t; 40) {
// pick a different colour
}
EDIT
Since May 2014 tinycolor now has a getBrightness() function, albeit using the CCIR601 weighting factors instead of the ITU-R ones above.
EDIT
The resulting luma value range is 0..255, where 0 is the darkest and 255 is the lightest. Values greater t...
How does database indexing work? [closed]
...ive million rows and is unindexed. The performance of several queries will now be analyzed. These are a query using the id (a sorted key field) and one using the firstName (a non-key unsorted field).
Example 1 - sorted vs unsorted fields
Given our sample database of r = 5,000,000 records of a fixe...
Storing Data in MySQL as JSON
...these two if MySQL doesn't cut it for you. They should have grown a lot by now.
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What are best practices for validating email addresses on iOS 2.0
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Read the RFC. Almost everyone that thinks they know how to parse/clean/validate an email address is wrong.
http://tools.ietf.org/html/rfc2822
Section 3.4.1 is very useful. Notice
dtext = NO-WS-CTL / ; Non white space controls
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Initialising mock objects - MockIto
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There is now (as of v1.10.7) a fourth way to instantiate mocks, which is using a JUnit4 rule called MockitoRule.
@RunWith(JUnit4.class) // or a different runner of your choice
public class YourTest
@Rule public MockitoRule rule =...
JComboBox Selection Change Listener?
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I know this question is old, but in order to complement, ActionListener is also fired if addItem method is called.
– Gabriel Câmara
Feb 23 '15 at 16:01
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How to convert SQL Query result to PANDAS Data Structure?
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Edit: Mar. 2015
As noted below, pandas now uses SQLAlchemy to both read from (read_sql) and insert into (to_sql) a database. The following should work
import pandas as pd
df = pd.read_sql(sql, cnxn)
Previous answer:
Via mikebmassey from a similar question
imp...
What is the easiest way to make a C++ program crash?
... to make a quick C++ program that crashes on purpose but I don't actually know the best and shortest way to do that, does anyone know what to put between my:
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Download a specific tag with Git
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This does (at least now) work for tags, though you end up in a detached HEAD state.
– mxcl
Jun 24 '13 at 23:31
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How do I initialize an empty array in C#?
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If you are going to use a collection that you don't know the size of in advance, there are better options than arrays.
Use a List<string> instead - it will allow you to add as many items as you need and if you need to return an array, call ToArray() on the variable.
var...