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Abusing the algebra of algebraic data types - why does this work?
...lgebraic' expression for algebraic data types looks very suggestive to someone with a background in mathematics. Let me try to explain what I mean.
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Anyone else find naming classes and methods one of the most difficult parts in programming? [closed]
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One lesson I have learned, is that if you can't find a name for a class, there is almost always something wrong with that class:
you don't need it
it does too much
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Difference between initLoader and restartLoader in LoaderManager
...ft unchanged and any previous
callbacks replaced with the newly provided ones. If there is not
currently a Loader for the ID, a new one is created and started.
This function should generally be used when a component is
initializing, to ensure that a Loader it relies on is created. This
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Get all related Django model objects
...ng to figure this out so I could implement a kind of "Observer Pattern" on
one of my models. Hope it's helpful.
Django 1.8+
Use _meta.get_fields(): https://docs.djangoproject.com/en/1.10/ref/models/meta/#django.db.models.options.Options.get_fields (see reverse in the _get_fields() source also)
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In which order do CSS stylesheets override?
.../cascade.html#cascade
In short: more specific rules override more general ones. Specificity is defined based on how many IDs, classes, and element names are involved, as well as whether the !important declaration was used. When multiple rules of the same "specificity level" exist, whichever one app...
SQL join: selecting the last records in a one-to-many relationship
...ve a table of customers and a table of purchases. Each purchase belongs to one customer. I want to get a list of all customers along with their last purchase in one SELECT statement. What is the best practice? Any advice on building indexes?
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How to determine if binary tree is balanced?
...e: suppose the tree is massively unbalanced. Like, a million nodes deep on one side and three deep on the other. Is there a scenario in which this algorithm blows the stack? Can you fix the implementation so that it never blows the stack, even when given a massively unbalanced tree?
UPDATE: Donal F...
:: (double colon) operator in Java 8
...
Usually, one would call the reduce method using Math.max(int, int) as follows:
reduce(new IntBinaryOperator() {
int applyAsInt(int left, int right) {
return Math.max(left, right);
}
});
That requires a lot of syntax...
+ operator for array in PHP?
...ts from the right-hand array will be ignored.
So if you do
$array1 = ['one', 'two', 'foo' => 'bar'];
$array2 = ['three', 'four', 'five', 'foo' => 'baz'];
print_r($array1 + $array2);
You will get
Array
(
[0] => one // preserved from $array1 (left-hand array)
[1]...
Code block in numbered list (Wiki syntax)
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You could try the following wiki syntax, it works for me on 1.17
# one
#:<pre>
#::some stuff
#::some more stuff</pre>
# two
It is not perfect, because you end up with a more indent but it does allow one to use the wiki syntax for correctly formatted pre blocks over multiple lin...