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Why does isNaN(“ ”) (string with spaces) equal false?
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JavaScript interprets an empty string as a 0, which then fails the isNAN test. You can use parseInt on the string first which won't convert the empty string to 0. The result should then fail isNAN.
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How does the “final” keyword in Java work? (I can still modify an object.)
...ance variables.
import java.util.ArrayList;
import java.util.List;
class Test {
private final List foo;
public Test() {
foo = new ArrayList();
foo.add("foo"); // Modification-1
}
public void setFoo(List foo) {
//this.foo = foo; Results in compile time error...
Django: How to manage development and production settings?
...ath.
So, let's assume you created myapp/production_settings.py and myapp/test_settings.py in your source repository.
In that case, you'd respectively set DJANGO_SETTINGS_MODULE=myapp.production_settings to use the former and DJANGO_SETTINGS_MODULE=myapp.test_settings to use the latter.
From he...
How to cat a file containing code?
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This should work, I just tested it out and it worked as expected: no expansion, substitution, or what-have-you took place.
cat <<< '
#!/bin/bash
curr=`cat /sys/class/backlight/intel_backlight/actual_brightness`
if [ $curr -lt 4477 ]; then
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How to get image height and width using java?
... quick as only image size is read from the file and not the whole image. I tested it and there is no comparison to ImageIO.read performance. I hope someone will find this useful.
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Swift: Testing optionals for nil
...I have this weird situation where I cannot figure out how to appropriately test for optionals.
14 Answers
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Bootstrap: Open Another Modal in Modal
...ut truly stacks on top of it. It preserves scrolling behavior correctly. Tested in Bootstrap 3. For modals to stack as expected, you need to have them ordered in your Html markup from lowest to highest.
$(document).on('hidden.bs.modal', function (event) {
if ($('.modal:visible').length) {...
How to “test” NoneType in python?
... None in it or not.
Quoting from is docs,
The operators is and is not test for object identity: x is y is true if and only if x and y are the same object. x is not y yields the inverse truth value.
Since there can be only one instance of None, is would be the preferred way to check None.
H...
Python: Check if one dictionary is a subset of another larger dictionary
...a set-like view of the dict items. You can then use the <= operator to test if one view is a "subset" of the other:
d1.items() <= d2.items()
In Python 2.7, use the dict.viewitems() to do the same:
d1.viewitems() <= d2.viewitems()
In Python 2.6 and below you will need a different solu...
Java: how can I split an ArrayList in multiple small ArrayLists?
...ecause java doc stats : The outer list is unmodifiable, but reflects the latest state of the source list. The inner lists are sublist views of the original list. This is
– Junchen Liu
Mar 2 '15 at 17:18
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