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Null variable value


Null variable value

By : Gireesh Sakthi
Date : November 22 2020, 10:38 AM
hope this fix your issue I'm still new with php. , $tglLahir is a property of the class orang, so in umur(), instead of:
code :
list($tgl,$bln,$thn) = explode('-',$tglLahir); 
list($tgl,$bln,$thn) = explode('-',$this->tglLahir); 


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During a data race can a thread ever read initial null value of volatile variable? especially when a non null value is a

During a data race can a thread ever read initial null value of volatile variable? especially when a non null value is a


By : user2510807
Date : March 29 2020, 07:55 AM
will be helpful for those in need When Java 1.5 was released, there was a provision in the JMM that said that the HashEntry can be partially initialized. That is, when a thread is putting into the map, the HashEntry is created and assigned as a reference to either the bucket head or a collison member. At that time the value of the entry, may have not been assigned to be seen by the other threads.
The CHM assumes that if the entry isnt null, then the value shouldn't be null so readValueUnderLock was put in as a failsafe.
Is it acceptable to use variable != null instead of variable !== undefined && variable !== null?

Is it acceptable to use variable != null instead of variable !== undefined && variable !== null?


By : Nikola Toshev
Date : March 29 2020, 07:55 AM
will help you The semantics of != are well-defined. If you compare to null, then:
if "cur" is undefined or null, then the result is false if "cur" is anything else, then the result is true
Sending null variable to methods and compare them with Entity null variables in Linq

Sending null variable to methods and compare them with Entity null variables in Linq


By : Fen Idir
Date : March 29 2020, 07:55 AM
this will help I have a method, I'm sending username, password, emails vs. to this method and I'm querying with Linq if there is same record. But when user send a null value it is not same as the linq entities null value it returns false. , You can do it in this way :
code :
public int GetTheUserID(string login, string pass, bool isAD)
    {
        try
        {
            if (query.Any()) query = query.Where(x => (x.LoginName == login) 
                  && ((pass == null) ? x.Password_ == null : x.Password_ == pass) 
                  && (isAD == x.ADUser) && (x.Deleted == false));
            else query = Entity.SecurityUsers.Where(x => (x.LoginName == login) 
                  && ((pass == null) ? x.Password_ == null : x.Password_ == pass)
                  && (isAD == x.ADUser) && (x.Deleted == false));
            if (query.Any())
            {
                singleresult.TransactionResult = query.FirstOrDefault();
                return singleresult.TransactionResult.ID;
            }
            else return 0;
        }
        catch (Exception ex)
        {
            return 0;
        }
    }
Why the static variable is not set to null when the local variable storing that reference is set to null?

Why the static variable is not set to null when the local variable storing that reference is set to null?


By : rbrbrbrbrb
Date : March 29 2020, 07:55 AM
Does that help I have following code : , After this line:
code :
Employee emp = InstanceManager.GetEmployee();
emp = null;
Is setting variables null in a model a good way to make the variable null (until it's changed)?

Is setting variables null in a model a good way to make the variable null (until it's changed)?


By : Oscar Giraldo
Date : March 29 2020, 07:55 AM
help you fix your problem Ints/doubles in my app convert themselves to "0" if no value is entered by the user in the view. To stop this from happening I use "= null" in my model. , This will do already:
code :
public double? Distance { get; set; }
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