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In Functional Programming, what is a functor?
...type is unknown, it is written as a type parameter a, as in T a.
Examples include lists (zero or more elements of type a), the Maybe type (zero or one elements of type a), sets of elements of type a, arrays of elements of type a, all kinds of search trees containing values of type a, and lots of ot...
Working with $scope.$emit and $scope.$on
...hods?
You can send any object you want within the hierarchy of your app, including $scope.
Here is a quick idea about how broadcast and emit work.
Notice the nodes below; all nested within node 3. You use broadcast and emit when you have this scenario.
Note: The number of each node in this exam...
How do you match only valid roman numerals with a regular expression?
...by M{4}
You could, of course, use something like M* to allow any number (including zero) of thousands, if you want to allow bigger numbers.
Next is (CM|CD|D?C{0,3}), slightly more complex, this is for the hundreds section and covers all the possibilities:
0: <empty> matched by D?C{0} (w...
MySQL Error 1093 - Can't specify target table for update in FROM clause
...eed the subquery, there's a workaround, but it's
ugly for several reasons, including performance:
UPDATE tbl SET col = (
SELECT ... FROM (SELECT.... FROM) AS x);
The nested subquery in the FROM clause creates an implicit temporary
table, so it doesn't count as the same table you're updating.
...
Why are these numbers not equal?
...t arithmetic across programming languages
Several Stack Overflow questions including
Why are floating point numbers inaccurate?
Why can't decimal numbers be represented exactly in binary?
Is floating point math broken?
Canonical duplicate for "floating point is inaccurate" (a meta discussion about...
Really weird eclipse keyboard behavior/bug?
...e the same symptoms on Eclipse Windows, just press all your mouse buttons (including the wheel if you have one) at the same time together, and that seems to fix it.
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How to access and test an internal (non-exports) function in a node.js module?
...ontext(context);
return context;};
There are some more things that are included in a node module's gobal module object that might also need to go into the context object above, but this is the minimum set that I need for it to work.
Here's an example using mocha BDD:
var util = require('./te...
What's the point of NSAssert, actually?
...tes:
When invoked, an assertion handler prints an error message that
includes the method and class names (or the function name). It then
raises an NSInternalInconsistencyException exception.
NSAssert:
NSException:
...
What is the difference D3 datum vs. data?
...ion and combine them into an array that is returned. So, if your selection includes 3 DOM elements with the data "a", "b" and "c" bound to each respectively, selection.data() returns ["a", "b", "c"]. It is important to note that if selection is a single element with (by way of example) the datum "a"...
How come an array's address is equal to its value in C?
...
In C, when you use the name of an array in an expression (including passing it to a function), unless it is the operand of the address-of (&) operator or the sizeof operator, it decays to a pointer to its first element.
That is, in most contexts array is equivalent to &arra...