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Quitting method chain execution early


Quitting method chain execution early

By : Roque Souza
Date : November 17 2020, 11:52 AM
this one helps. In this situation you probably want to raise an exception in the constructor if a required argument isn't supplied.
If the argument is actually optional, you need to slightly rethink how you're structuring you program. You should drop the quit_if_ prefix, that's never going to work, and its not supposed to work. You can't invent new forms of program flow that way. There is no way you can (or should) be able to jump out of a method that way. If you want to, you need to be more explicit with a raise or throw and a rescue/catch.
code :
  def perform
    return if should_quit?
    print_message
  end

  def should_quit?
    @data == nil
  end
 def perform
   with_data do
     print_message
   end
 end

 def with_data
   yield if @data
 end


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Why is my onsubmit function quitting early and not returning false?

Why is my onsubmit function quitting early and not returning false?


By : user1688909
Date : March 29 2020, 07:55 AM
hope this fix your issue , Why not wrap it in a try block?
code :
function Validate() {
    try {
        alert($("#email").val());
    } catch (e) {
        alert("Problem: " + e);
    }

    return false;
}
Which method is called during Constructor chain execution with an overriding method

Which method is called during Constructor chain execution with an overriding method


By : Pulau Tidung
Date : March 29 2020, 07:55 AM
it fixes the issue If you instantiate the overriding class, then its overriding methods will be the ones executed.
code :
Bicycle bike;

bike = new Bicycle(1,2,3);
bike.setGear(8);//Bicycle's setGear is run

bike = new MountainBike(1,2,3,4);
bike.setGear(8);//MountainBike's setGear is run
Bicycle b=new MountainBike(1,2,3,4);
Conditionally quitting early on a chain of promises without throwing an error

Conditionally quitting early on a chain of promises without throwing an error


By : 張維倫
Date : March 29 2020, 07:55 AM
this will help If register(identity, password) returns a promise, you can reorganise your code as follows:
code :
router.post('/register', function(req, res, next) {
    var identity = req.body.identity;
    var password = req.body.password;

    // can't register without a reservation
    hasReservation(identity)
    .then(function(hasReservation) {
        if (hasReservation) { 
            return register(identity, password)
            .then(function(user) {
                // in my app, registering an existing user is okay
                // I just want to reset a few things about the user and save
                // but I don't want to be here if there's no reservation
                if (user) {
                    user.foo = 'bar';
                    return user.save().then(function() { return user; });
                } else {
                    return register(identity, password);
                }
            })
            .then(function(user) {
                // I want to do more asynch stuff here
            })
            .then(function(result) {
                res.json(result);
            })
        } else {
            // stuck here: I want to say:
            res.json({ registered: false, reason: "missing reservation" });
            // and then I want to stop further promises
            // but this isn't an error, I don't want to throw an error here
        }
    })
    .catch(function(error) {
        res.status(500).json(error);
    });
});
        return Promise.resolve(register(identity, password))
How to fix my code from quitting too early?

How to fix my code from quitting too early?


By : Akadalow
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Every time I run the code and purposely put the wrong input to get the output Please enter a valid choice! and it does it but then the program just ends. , you can change the while condition to
code :
while (choice != 6);
Ensuring certain steps occur in promise chain or stopping chain early

Ensuring certain steps occur in promise chain or stopping chain early


By : preddz
Date : September 08 2020, 04:00 AM
will help you You'll want to use .then(…, …) instead of .then(…).catch(…) to only handle rejections from loadLinkTableFromDB but not from pushLinkTableToDB:
code :
dispatch(loadLinkTableFromDB(username))
.then(loadLinkTableResultMsg) => {
    console.log('Successfully loaded link table: ', loadLinkTableResultMsg)
    return dispatch(pushLinkTableToDB(username))
}, loadLinkTableErrorReason => {
    console.log('Failed to load link table from DB: ', loadLinkTableErrorReason);
    if (allReasonsAcceptableForOverwrite(loadLinkTableErrorReason)) {
        return dispatch(pushLinkTableToDB(username));
    } else {
        throw loadLinkTableErrorReason; 
    }
})
.then( /* do more stuff that relies on the LinkTable */ )
.catch(unacceptableRejectionReasons => {
    console.log('unacceptableRejectionReasons :', unacceptableRejectionReasons);
})
dispatch(loadLinkTableFromDB(username))
.then(loadLinkTableResultMsg) => {
    console.log('Successfully loaded link table: ', loadLinkTableResultMsg)
}, loadLinkTableErrorReason => {
    console.log('Failed to load link table from DB: ', loadLinkTableErrorReason);
    if (!allReasonsAcceptableForOverwrite(loadLinkTableErrorReason)) {
        throw loadLinkTableErrorReason; 
    }
})
.then(() => dispatch(pushLinkTableToDB(username)))
.then( /* do more stuff that relies on the LinkTable */ )
.catch(unacceptableRejectionReasons => {
    console.log('unacceptableRejectionReasons :', unacceptableRejectionReasons);
})
dispatch(loadLinkTableFromDB(username))
.catch(loadLinkTableErrorReason => {
    if (!allReasonsAcceptableForOverwrite(loadLinkTableErrorReason)) {
        throw loadLinkTableErrorReason; 
    }
})
.then(() => dispatch(pushLinkTableToDB(username)))
.then( /* do more stuff that relies on the LinkTable */ )
.catch(unacceptableRejectionReasons => {
    console.log('unacceptableRejectionReasons :', unacceptableRejectionReasons);
})
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