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Why does Javascript's regex.exec() not always return the same value? [duplicate]
...ore matches by performing the assignment as the loop condition.
var re = /foo_(\d+)/g,
str = "text foo_123 more text foo_456 foo_789 end text",
match,
results = [];
while (match = re.exec(str))
results.push(+match[1]);
DEMO: http://jsfiddle.net/pPW8Y/
If you don't like the pla...
Object.watch() for all browsers?
... syntax from the Firefox way of adding observers. Instead of :
var obj = {foo:'bar'};
obj.watch('foo', fooChanged);
You do:
var obj = {foo:'bar'};
var watcher = createWatcher(obj);
watcher.watch('foo', fooChanged);
Not as sweet, but as an observer you are notified immediately.
...
Match multiple cases classes in scala
...String parameters, and want to treat B and C the same, so:
def matcher(l: Foo): String = {
l match {
case A() => "A"
case B(_) | C(_) => "B"
case _ => "default"
}
}
If you must, must, must extract the parameter and treat them in the same code block, you could:
def matche...
What is tail call optimization?
...lute; there's also TRMC, at least in theory, which would optimize (cons a (foo b)) or (+ c (bar d)) in tail position in the same way.
– Will Ness
Sep 20 '16 at 16:58
...
How do I assert an Iterable contains elements with a certain property?
...:
assertThat( myClass.getMyItems(), contains(
hasProperty("name", is("foo")),
hasProperty("name", is("bar"))
));
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...
Are HLists nothing more than a convoluted way of writing tuples?
...f1.toList // Inferred type is List[Int]
val t2 = (23, ((true, 2.0, "foo"), "bar"), (13, false))
val f2 = flatten(t2)
val t2b = f2.tupled
// Inferred type of t2b is (Int, Boolean, Double, String, String, Int, Boolean)
Without using HLists (or something equivalent) to abstract over the arity ...
Is the LIKE operator case-sensitive with MSSQL Server?
...u can always use the COLLATE clause, e.g.
USE tempdb;
GO
CREATE TABLE dbo.foo(bar VARCHAR(32) COLLATE Latin1_General_CS_AS);
GO
INSERT dbo.foo VALUES('John'),('john');
GO
SELECT bar FROM dbo.foo
WHERE bar LIKE 'j%';
-- 1 row
SELECT bar FROM dbo.foo
WHERE bar COLLATE Latin1_General_CI_AS LIKE...
Location of parenthesis for auto-executing anonymous JavaScript functions?
...nexpected token (
> (function(){})()
undefined
> (function(){return 'foo'})()
"foo"
> (function(){ return 'foo'}())
"foo"
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...
Create an enum with string values
...artially what enums are used for).
type Options = "hello" | "world";
var foo: Options;
foo = "hello"; // Okay
foo = "asdf"; // Error!
More : https://www.typescriptlang.org/docs/handbook/advanced-types.html#string-literal-types
Legacy Support
Enums in TypeScript are number based.
You can use...
How do I create a namespace package in Python?
...means there are now three types of object that can be created by an import foo:
A module represented by a foo.py file
A regular package, represented by a directory foo containing an __init__.py file
A namespace package, represented by one or more directories foo without any __init__.py files
Pac...