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How to tell the compiler that a property is only accessed if it exists?


How to tell the compiler that a property is only accessed if it exists?

By : rahul
Date : November 21 2020, 07:38 AM
this one helps. You have to include the reference to Microsoft.CSharp to get this working and you need using System.Reflection;. This is my solution:
code :
if(UIApplication.SharedApplication.Delegate.HasMethod("SomeMethod"))
{
    MethodInfo someMethodInfo = UIApplication.SharedApplication.Delegate.GetType().GetMethod("SomeMethod");
    // calling SomeMethod with true as parameter on AppDelegate
    someMethodInfo.Invoke(UIApplication.SharedApplication.Delegate, new object[] { true });
}
public static bool HasMethod(this object objectToCheck, string methodName)
{
    var type = objectToCheck.GetType();
    return type.GetMethod(methodName) != null;
} 


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Is there a way to generate a compiler warning when a specific property is accessed?

Is there a way to generate a compiler warning when a specific property is accessed?


By : omer afzal
Date : March 29 2020, 07:55 AM
I hope this helps . The example is that I would like to generate a warning each time the property -[UIViewController navigationController] is accessed. , You can create a custom getter and declare it as deprecated:
code :
- (UINavigationController*)navigationController __attribute__ ((deprecated))
{
    // do something
}
'selectionStart' property exists (?) but cannot be accessed

'selectionStart' property exists (?) but cannot be accessed


By : Alan Balderas Sánche
Date : March 29 2020, 07:55 AM
With these it helps You can not access selectionStart of a type hidden element, or even type button: http://jsfiddle.net/DerekL/pbCnQ/
computed property not working on controller accessed though the needs-property

computed property not working on controller accessed though the needs-property


By : user2444892
Date : March 29 2020, 07:55 AM
this one helps. Without a user route in your router, the model hook in your UserRoute will never run. That means that the model of your UserController will always be empty. So the way you've set things up won't work for your use case. But, you have the same model on your ApplicationRoute, so why not use that controller instead?
code :
App.ApplicationController = Ember.ArrayController.extend({
    // Never use the `content` property, always use the `model` property, they are different
    userArray: Ember.computed.alias('model'),

    particularUser: function() {
        // Be sure to only grab the first item, not an array with the first item in it
        return this.get('userArray').filterBy('username', 'Sunchild').get('firstObject');
    }.property('userArray.@each.username')
});
App.LoginController = Ember.ArrayController.extend({
    needs: ['application'],
    userArray: Ember.comptued.alias('controllers.application.userArray']
});
Go: Property exists but Go compiler says it doesn't?

Go: Property exists but Go compiler says it doesn't?


By : erwen
Date : March 29 2020, 07:55 AM
will be helpful for those in need The writer File in a FileLogger is an interface (io.Writer), not a struct.
You would need a type assertion in order to access data of WriterMock:
code :
fileLooger.File.(*WriterMock).data
import "fmt"
import "io"

type WriterMock struct {
    data []byte
}

func (this WriterMock) Write(b []byte) (n int, err error) {
    this.data = append(this.data, b...)

    return len(this.data), nil
}

func main() {
    var w io.Writer = &WriterMock{}
    fmt.Printf("Hello, playground '%+v'", w.(*WriterMock).data)
}
Hello, playground '[]'
str, ok := value.(string)
if ok {
    fmt.Printf("string value is: %q\n", str)
} else {
    fmt.Printf("value is not a string\n")
}
Javascript object property accessed via brackets assigned another property's value?

Javascript object property accessed via brackets assigned another property's value?


By : chaos
Date : March 29 2020, 07:55 AM
will be helpful for those in need The problem is with types here.
foo is an object, you can't access a property of an object with another object as a key.
code :
myObject[foo] = 'foo';
myObject[bar] = 'bar';
myObject["[object Object]"] = 'foo';
myObject["[object Object]"] = 'bar';
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