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Generate unique random numbers between 1 and 100
... This is how I always do it, too. So if I wanted ten random lines from a file with a bunch of lines in it, I do randlines file | head -10.
– tchrist
Sep 9 '12 at 19:38
1
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The provided URI scheme 'https' is invalid; expected 'http'. Parameter name: via
...; I was having the same issue and changing the <security> tag's mode from the default of "None" to "Transport" fixed it.
– Otis
Apr 7 '11 at 23:29
1
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Volatile boolean vs AtomicBoolean
...t you write code that is guaranteed to execute only once, even when called from multiple threads. For example:
final AtomicBoolean isJobDone = new AtomicBoolean(false);
...
if (isJobDone.compareAndSet(false, true)) {
listener.notifyJobDone();
}
Is guaranteed to only notify the listener once...
How do I check if an array includes a value in JavaScript?
...y frameworks also offer similar methods:
jQuery: $.inArray(value, array, [fromIndex])
Underscore.js: _.contains(array, value) (also aliased as _.include and _.includes)
Dojo Toolkit: dojo.indexOf(array, value, [fromIndex, findLast])
Prototype: array.indexOf(value)
MooTools: array.indexOf(value)
Moc...
How to quickly check if folder is empty (.NET)?
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The typecast can be removed from the first code example: return !items.GetEnumerator().MoveNext();
– gary
Feb 10 '14 at 3:47
...
class
....instance_methods.include? :a #=> true
hi object inherits its #methods from its #singleton_class.instance_methods and then from its #class.instance_methods.
Here we gave hi's singleton class instance method :a. It could have been done with class << hi instead.
hi's #singleton_class has all...
What is the naming convention in Python for variable and function names?
Coming from a C# background the naming convention for variables and method names are usually either camelCase or PascalCase:
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SharedPreferences.onSharedPreferenceChangeListener not being called consistently
...It will work at first, but eventually, will get garbage collected, removed from the WeakHashMap and stop working.
Keep a reference to the listener in a field of your class and you will be OK, provided your class instance is not destroyed.
i.e. instead of:
prefs.registerOnSharedPreferenceChangeLis...
Does opacity:0 have exactly the same effect as visibility:hidden
...
Here is a compilation of verified information from the various answers.
Each of these CSS properties is unique. In addition to rendering an element not visible, they have the following additional effect(s):
Collapses the space that the element would normally occupy
Re...
Build the full path filename in Python
I need to pass a file path name to a module. How do I build the file path from a directory name, base filename, and a file format string?
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