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Match multiple cases classes in scala
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Looks like you don't care about the values of the 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 ...
Setting default value for TypeScript object passed as argument
...ks in TypeScript 1.5:
function sayName({ first, last = 'Smith' }: {first: string; last?: string }): void {
const name = first + ' ' + last;
console.log(name);
}
sayName({ first: 'Bob' });
The trick is to first put in brackets what keys you want to pick from the argument object, with key=valu...
How to get position of a certain element in strings vector, to use it as an index in ints vector?
I am trying to get the index of an element in a vector of strings , to use it as an index in another vector of int type, is this possible ?
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Unique Key constraints for multiple columns in Entity Framework
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EF 6 and below:
First approach:
dbContext.Database.ExecuteSqlCommand(string.Format(
@"CREATE UNIQUE INDEX LX_{0} ON {0} ({1})",
"Entitys", "FirstColumn, SecondColumn"));
This approach is very fast and useful but the main problem is th...
Apply function to all elements of collection through LINQ [duplicate]
...n to execute this code when clicked: myEnumerable.AsParallel().ForAll(i as string => otherDictionary.Add(i, 0)) . It will add null as a key to otherDictionary. I had to rewrote to use foreach loop. Weird.
– YukiSakura
Dec 22 '15 at 8:13
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Serializing object that contains cyclic object value
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Use the second parameter of stringify, the replacer function, to exclude already serialized objects:
var seen = [];
JSON.stringify(obj, function(key, val) {
if (val != null && typeof val == "object") {
if (seen.indexOf(val) >= 0)...
What is the iPad user agent?
...seems you can't detect whether the device is iPad just from the user-agent string.
(Note: I'm on Snow Leopard which the User Agent string for Safari is
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_2; en-us) AppleWebKit/531.21.8 (KHTML, like Gecko) Version/4.0.4 Safari/531.21.10
)
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How do I write data into CSV format as string (not file)?
...ast data like [1,2,'a','He said "what do you mean?"'] to a CSV-formatted string.
6 Answers
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Call static method with reflection
...me.EndsWith("PrettyPrinter"))
.Select(t => (Func<object, string>)Delegate.CreateDelegate(
typeof(Func<object, string>),
null,
t.GetMethod("Print", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.Publi...
android get all contacts
...get all the names of the contacts in my Android and put them into array of strings?
8 Answers
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