How do I abort object instance creation in Python?

When you override __new__, dont forget to call to super! >>> class Test(object): … def __new__(cls, x): … if x: … return super(Test, cls).__new__(cls) … else: … raise ValueError … >>> obj1 = Test(True) >>> obj2 = Test(False) Traceback (most recent call last): File “<stdin>”, line 1, in <module> File “<stdin>”, line 6, in __new__ … Read more

Get companion object of class by given generic type Scala

A gist by Miles Sabin may give you a hint: trait Companion[T] { type C def apply() : C } object Companion { implicit def companion[T](implicit comp : Companion[T]) = comp() } object TestCompanion { trait Foo object Foo { def bar = “wibble” // Per-companion boilerplate for access via implicit resolution implicit def companion … Read more

Object.keys using numbers in typescript

All keys are strings in JavaScript – just use map: const sizes: number[] = Object.keys(foo).map(Number); This’ll only work for numeric strings – if it’s a European string involving decimals, for instance, it’ll be NaN, and that never ends well. console.log(Number(“10,7”)); Or change either of your types: const sizes: string[] = Object.keys(foo); Or: type Foo = … Read more

How to set array length in c# dynamically

InputProperty[] ip = new InputProperty[nvPairs.Length]; Or, you can use a list like so: List<InputProperty> list = new List<InputProperty>(); InputProperty ip = new (..); list.Add(ip); update.items = list.ToArray(); Another thing I’d like to point out, in C# you can delcare your int variable use in a for loop right inside the loop: for(int i = 0; … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)