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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 ...
Accessing a Dictionary.Keys Key through a numeric index
I'm using a Dictionary<string, int> where the int is a count of the key.
15 Answers
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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...
How to check if an object is nullable?
...t;T>(T? t) where T : struct { return true; }
}
then
static void Main(string[] args)
{
int a = 123;
int? b = null;
object c = new object();
object d = null;
int? e = 456;
var f = (int?)789;
bool result1 = ValueTypeHelper.IsNullable(a); // false
bool result2 = Val...
How to force NSLocalizedString to use a specific language
On iPhone NSLocalizedString returns the string in the language of the iPhone.
Is it possible to force NSLocalizedString to use a specific language to have the app
in a different language than the device ?
...
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 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;
}
}
share
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How to set the prototype of a JavaScript object that has already been instantiated?
...get[key] = mixin[key];
}
// Take care of IE clobbering `toString` and `valueOf`
if (mixin && mixin.toString !== Object.prototype.toString) {
target.toString = mixin.toString;
} else if (mixin && mixin.valueOf !== Object.prototype.valueOf) {
...
What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
What is meant by String Pool ? And what is the difference between the following declarations:
5 Answers
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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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