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How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
...res6: Option[List[Int]] = Some(List(1, 2, 3))
scala> Registry.get[List[String]]("a")
res7: Option[List[String]] = None
When storing an element, we store a "Manifest" of it too. A Manifest is a class whose instances represent Scala types. These objects have more information than JVM does, which ...
How to design a product table for many kinds of product where each product has many parameters
...e table for Products, storing attributes common to all product types. One extra column stores a BLOB of semi-structured data, in XML, YAML, JSON, or some other format. This BLOB allows you to store the attributes specific to each product type. You can use fancy Design Patterns to describe this, s...
Initializing select with AngularJS and ng-repeat
..."the correct way" doesn't work sometimes (eg. if you want to translate the strings that populate the option names)
– btk
Mar 16 '15 at 21:10
11
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How to find the JVM version from a program?
... Worth noting that the Java 9 will change the returned value from this string.
– AlBlue
Apr 20 '16 at 19:12
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What's the difference between an object initializer and a constructor?
...nstances of one or more other classes. For example see File.Create Method (String) (and its overloads) which creates a FileStream object.
– DavidRR
Jan 17 '18 at 18:13
add a c...
How would I create a UIAlertView in Swift?
...should only be used when UIAlertController is not available. if NSClassFromString("UIAlertController") != nil { /* use UIAlertController * / } else { /* use UIAlertView * / }
– phatblat
Apr 16 '15 at 17:01
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What is the { get; set; } syntax in C#?
...r the following (similar code will be generated by the compiler):
private string name;
public string Name
{
get
{
return this.name;
}
set
{
this.name = value;
}
}
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What is the “__v” field in Mongoose
...n_key, you can just:
var UserSchema = new mongoose.Schema({
nickname: String,
reg_time: {type: Date, default: Date.now}
}, {
versionKey: false // You should be aware of the outcome after set to false
});
Setting the versionKey to false means the document is no longer versioned.
This...
Why not abstract fields?
...ised in its constructor (untested code):
abstract class Base {
final String errMsg;
Base(String msg) {
errMsg = msg;
}
abstract String doSomething();
}
class Sub extends Base {
Sub() {
super("Sub message");
}
String doSomething() {
return e...
How to handle both a single item and an array for the same property using JSON.net
...y that can vary between a single item and an array, define it as a List<string> and mark it with a [JsonConverter] attribute so that JSON.Net will know to use the custom converter for that property. I would also recommend using [JsonProperty] attributes so that the member properties can be g...