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Limiting a typeof() parameter on an attribute to specific types only...is this possible?


By : user3851641
Date : October 16 2020, 11:12 AM
I think the issue was by ths following , Not as a compile-time feature. That's equivalent to only being able to accept int parameters between 10 and 20; this sort of check has to be performed in your code, it can't be declared.
code :


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Using specific types based on typeof inside generic function


By : user1544441
Date : March 29 2020, 07:55 AM
wish helps you It feels to me like it would be better to have an overloaded method in this case. There's nothing really generic about calling TryParse - Int32.TryParse is an entirely different method from Int64.TryParse etc. That will get you away from the double cast, too (which I agree is ugly, but unfortunately hard to avoid). It also means you'd be specifying which types you can genuinely support.
One alternative is to use a Dictionary>:
code :
// Add some error checking, obviously :)
Func<string, object> parser = parsers[typeof(T)];
return (T) parser(form.Text);
static readonly Dictionary<Type, Func<string, object>> parsers = 
    new Dictionary<Type, Func<string, object>>()
{
    { typeof(int), x => int.Parse(x) },
    { typeof(TimeSpan) x => new TimeSpan(0, 1, 0) },
    ...
}

Typescript syntax to loop through types -- let type Types = typeof myObject[number]


By : adsffdsa
Date : March 29 2020, 07:55 AM
Hope that helps I was also intrigued by this syntax . Turns out this is what you call a lookup type. It's best explained in the annoucement blog of Typescript 2.1 here.
In your case things are much easier to understand if we explicitly write out the type,
code :
interface Actions {
  [index: number] = ActionType1 | ActionType2
}
const returnsOfActions: Actions = Object.values(actions).map($call);
export type TodosAction = typeof returnsOfActions[number];

Searching and limiting to specific file types VS2017


By : user3094030
Date : March 29 2020, 07:55 AM
Hope that helps Open "Find in Files" dialog by going Main Manu → Edit → Find and Replace → Find in Files, set file mask to *.cpp; or whatever.

argument of type typeof '..' is not assignable to parameter of type 'router'. Property param is missing in type typeof '


By : vijay antharam
Date : March 29 2020, 07:55 AM
wish of those help TypeScript doesn't know about module.exports assignments. You should write export = router in route.ts instead.

TypeScript array (tuple) destructuring specific types for positions using keyof typeof


By : Hailong
Date : October 01 2020, 12:00 AM
I wish did fix the issue. .split returns an Array, not a tuple. You will have to use as any and explicitly cast if you are really sure of what you are doing or write a function that checks the output for you.
With any:
code :
const [validator, argument]: [keyof typeof validators, string] = validation.split(':') as any;
const isKeyOf = <T extends object>(k: string | keyof T, obj: T): k is (keyof T) => obj.hasOwnProperty(k)

const safer = (from: string): [keyof typeof validators, string] => {
  const [first, second] = string.split(":)

  if (first && second && isKeyOf(first, validators)) {
    return [first, second]
  }

  return Error("Not a valid input.")
}
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