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how to use javascript Object.defineProperty
...last but one line: the responsibility for correct discount value was moved from the client code (e-shop definition) to the product definition. The product is responsible for keeping its data members consistent. Good design is (roughly said) if the code works the same way as our thoughts.
So much ab...
How do you Force Garbage Collection from the Shell?
...rm program.
Fire it up like so:
java -jar jmxterm-1.0-alpha-4-uber.jar
From there, you can connect to a host and trigger GC:
$>open host:jmxport
#Connection to host:jmxport is opened
$>bean java.lang:type=Memory
#bean is set to java.lang:type=Memory
$>run gc
#calling operation gc of mb...
What is the difference between memoization and dynamic programming?
...t (which typically recurses down to solve the sub-problems).
A good slide from here (link is now dead, slide is still good though):
If all subproblems must be solved at least once, a bottom-up dynamic-programming algorithm usually outperforms a top-down memoized algorithm by a constant facto...
Get the first N elements of an array?
...
Use array_slice()
This is an example from the PHP manual: array_slice
$input = array("a", "b", "c", "d", "e");
$output = array_slice($input, 0, 3); // returns "a", "b", and "c"
There is only a small issue
If the array indices are meaningful to you, remembe...
Define css class in django Forms
...can create a custom filter "addcss" in "my_app/templatetags/myfilters.py"
from django import template
register = template.Library()
@register.filter(name='addcss')
def addcss(value, arg):
css_classes = value.field.widget.attrs.get('class', '').split(' ')
if css_classes and arg not in css_...
How to publish a website made by Node.js to Github Pages?
....It contains pure html files.So everything you see on the link is actually from the gh-pages branch.
– Akshat Jiwan Sharma
Apr 17 '13 at 18:26
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Convert Json Array to normal Java list
...I've found useful where you don't need to use JSONArray to extract objects from JSONObject.
import org.json.simple.JSONObject;
import org.json.simple.JSONValue;
String jsonStr = "{\"types\":[1, 2]}";
JSONObject json = (JSONObject) JSONValue.parse(jsonStr);
List<Long> list = (List<Long>...
Scalar vs. primitive data type - are they the same thing?
... I was taught (a very long time ago in school) that the term was derived from 'scalar processor' in contrast to a 'vector processor'. A scalar processor is a CPU that can only handle one piece of data at a time. These processors were/are named after the arithmetic terms. Interestingly enough, when...
Different bash prompt for different vi editing mode?
...
Fresh bash 4.3 and readline 6.3 have something for you guys.. from the changelog:
4. New Features in Readline
j. New user-settable variable, show-mode-in-prompt, adds a characters to the
beginning of the prompt indicating the current editing mode.
So putting
set show-mode-in-p...
Should I use a data.frame or a matrix?
...haring @Gavin Simpson! Could you introduce a bit more about how to go back from 1-6 to a-f?
– YJZ
Jul 20 '15 at 14:40
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