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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
...
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 ...
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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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...
理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...he lines of: 如果不用with语句，代码如下：
file = open("/tmp/foo.txt")
data = file.read()
file.close()
There are two annoying things here. First, you end up forgetting to close the file handler. The second is how to handle exceptions that may occur once the file handler has been obt...
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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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...
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...
Writing handler for UIAlertAction
...ult,
handler: {(alert: UIAlertAction!) in println("Foo")}))
this is the proper way to define handlers in Swift.
As Brian pointed out below, there are also easier ways to define these handlers. Using his methods is discussed in the book, look at the section titled Closures ...