typify | Runtime type checking for JavaScript
kandi X-RAY | typify Summary
kandi X-RAY | typify Summary
Runtime type checking for JavaScript
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of typify
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QUESTION
I don't undertand what's my code error when defining the get and set methods for a private field.
...ANSWER
Answered 2021-Apr-23 at 10:19That code should work. Playground
Why didn't your example work out?
When you parse item from local storage user
variable becomes something like this:
{ userName: "John", token: 30 }
But you accessing user.UserName
which does not exists so you have to mimic object from localStorage
like so user.userName
.
Ways to fix it:
- Create new instance of the
User
class
QUESTION
Some Haskell source code (see ref):
...ANSWER
Answered 2018-Dec-19 at 16:261)
(<*>)
is defined in terms ofliftA2
, whereliftA2
is defined in terms of(<*>)
. How does it work? I see no obvious "recursion-break" case...
It's not recursion. In your instance of Applicative
you can either define both of them or just one. If you define just (<*>)
then liftA2
is defined from (<*>)
, and vice versa.
2)
id
is ana -> a
function. Why is it passed intoliftA2
as an(a -> b -> c)
function?
Unification works as follows,
QUESTION
I wrote a method which "typifies" a String
, and tries to infer the type of data held within it. (A slightly modified version of this gist). The method returns the inferred Class
and the original String
(possibly slightly modified -- surrounding whitespace trimmed, etc.) in a Map.Entry
. For instance, typify("3f")
returns ,
typify(" c ")
returns and so on.
My next step was to write a second method which "decodes" these returned Map.Entry
objects so they can be directly assigned to an object of the inferred type. For instance:
ANSWER
Answered 2018-Dec-12 at 15:53You haven't broken anything. You can't assign null directly, but it's perfectly fine to assign it indirectly via a method call.
The reason for this is that by just assigning null
the compiler has no information to know what type you want. The only inference that can be made is for the most generic type available, Object
, and if that's the correct inference then just declare it as that explicitly! It's 3 extra characters.
When the compiler has a method call to use, it can use the return type of the method to make the type inference.
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