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Generate random string/characters in JavaScript
I want a 5 character string composed of characters picked randomly from the set [a-zA-Z0-9] .
77 Answers
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Unit tests vs Functional tests
.... He has the builder's perspective.
As a summary,
Unit Tests are written from a programmers perspective. They are made to ensure that a particular method (or a unit) of a class performs a set of specific tasks.
Functional Tests are written from the user's perspective. They ensure that the system i...
Remove all whitespaces from NSString
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stringByTrimmingCharactersInSet only removes characters from the beginning and the end of the string, not the ones in the middle.
1) If you need to remove only a given character (say the space character) from your string, use:
[yourString stringByReplacingOccurrencesOfString:@" ...
Set Matplotlib colorbar size to match graph
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You can do this easily with a matplotlib AxisDivider.
The example from the linked page also works without using subplots:
import matplotlib.pyplot as plt
from mpl_toolkits.axes_grid1 import make_axes_locatable
import numpy as np
plt.figure()
ax = plt.gca()
im = ax.imshow(np.arange(100).re...
Best way to do multiple constructors in PHP
... protected function fill( array $row ) {
// fill all properties from array
}
}
?>
Then if i want a Student where i know the ID:
$student = Student::withID( $id );
Or if i have an array of the db row:
$student = Student::withRow( $row );
Technically you're not building mult...
JPA OneToMany not deleting child
...All works well, only that child records are not deleted when I remove them from the collection.
8 Answers
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Why is a boolean 1 byte and not 1 bit of size?
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From Wikipedia:
Historically, a byte was the number of
bits used to encode a single character
of text in a computer and it is
for this reason the basic addressable
element in many computer
architectures.
So by...
How to log cron jobs?
...* * myjob.sh >> /var/log/myjob.log 2>&1
will log all output from the cron job to /var/log/myjob.log
You might use mail to send emails. Most systems will send unhandled cron job output by email to root or the corresponding user.
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Grouping functions (tapply, by, aggregate) and the *apply family
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@grautur I was actively pruning things from this answer to avoid it being (a) too long and (b) a re-write of the documentation. I decided that while aggregate, by, etc. are based on *apply functions, the way you approach using them is different enough from a users...
What is the difference between an ordered and a sorted collection?
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If SortedSet has inherited from Set and is having a is-a relationship with it then how can u say Set is without any order
– xpioneer
May 17 '19 at 7:21
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