parameters

问题 I'd like to do something like this: func doSomething(a: AnyObject, myType: ????) { if let a = a as? myType { //… } } In Objective-C the class of class was Class 回答1: You have to use a generic function where the parameter is only used for type information so you cast it to T : func doSomething<T>(_ a: Any, myType: T.Type) { if let a = a as? T { //… } } // usage doSomething("Hello World", myType: String.self) Using an initializer of the type T You don’t know the signature of T in general

问题 Trying to learn BLoCs I came up with this problem. I have some code in which I generate some buttons with BLoC pattern. However, I have no clue how to update specific buttons properties with dispatch(event) method. How to pass parameters to the event ChangeSomeValues ?? The part where the BLoC is used BlocBuilder( bloc: myBloc, builder: (context, state) { return ListView.builder( itemCount: state.buttonList.length, itemBuilder: (context, index) { return MyButton( label: buttonList[index]

问题 Trying to learn BLoCs I came up with this problem. I have some code in which I generate some buttons with BLoC pattern. However, I have no clue how to update specific buttons properties with dispatch(event) method. How to pass parameters to the event ChangeSomeValues ?? The part where the BLoC is used BlocBuilder( bloc: myBloc, builder: (context, state) { return ListView.builder( itemCount: state.buttonList.length, itemBuilder: (context, index) { return MyButton( label: buttonList[index]

问题 How can I get an execution_date parameter in outside of dag? execution_min = "{{execution_date.strftime('%M') }}" if execution_min == '00': logging.info('**** ' + "YES, It's 00") final_task = DummyOperator( task_id='task_y00', ... dag=dag ) else: logging.info('**** ' + "NOPE!!!") final_task = DummyOperator( task_id='task_n00', ... dag=dag ) I want to set a task stream with dynamically with execution_date (especially minute) But Jinja template won't work with template_fields = ['execution_date

问题 I'm writing a function that wraps a cmdlet using ValueFromRemainingArguments (as discussed here). The following simple code demonstrates the problem: works function Test-WrapperArgs { Set-Location @args } Test-WrapperArgs -Path C:\ does not work function Test-WrapperUnbound { Param( [Parameter(ValueFromRemainingArguments)] $UnboundArgs ) Set-Location @UnboundArgs } Test-WrapperUnbound -Path C:\ Set-Location: F:\cygwin\home\thorsten\.config\powershell\test.ps1:69 Line | 69 | Set-Location

问题 I'm writing a function that wraps a cmdlet using ValueFromRemainingArguments (as discussed here). The following simple code demonstrates the problem: works function Test-WrapperArgs { Set-Location @args } Test-WrapperArgs -Path C:\ does not work function Test-WrapperUnbound { Param( [Parameter(ValueFromRemainingArguments)] $UnboundArgs ) Set-Location @UnboundArgs } Test-WrapperUnbound -Path C:\ Set-Location: F:\cygwin\home\thorsten\.config\powershell\test.ps1:69 Line | 69 | Set-Location

问题 I am playing with Machine Learning in PySpark and am using a RandomForestClassifier. I have used Sklearn till now. I am using CrossValidator to tune the parameters and get the best model. A sample code taken from Spark's website is below. From what I have been reading, I do not understand whether spark distributes the parameter tuning as well or it is the same as in case of GridSearchCV of Sklearn. Any help would really appreciated. from pyspark.ml import Pipeline from pyspark.ml

问题 I am playing with Machine Learning in PySpark and am using a RandomForestClassifier. I have used Sklearn till now. I am using CrossValidator to tune the parameters and get the best model. A sample code taken from Spark's website is below. From what I have been reading, I do not understand whether spark distributes the parameter tuning as well or it is the same as in case of GridSearchCV of Sklearn. Any help would really appreciated. from pyspark.ml import Pipeline from pyspark.ml

问题 I'm using the OLE Automation Procedures to send a HTTP POST Request to a SOAP-Webservice and process the returned data. This works fine for me by using the code snipped below. Now I need to pass a POST-parameter over to the webservice. Any idea how i could do that? Parameter: searchstring Value: V34432221 DECLARE @XMLResponse xml DECLARE @obj INT DECLARE @ValorDeRegreso INT DECLARE @sUrl NVARCHAR(200) DECLARE @response VARCHAR(MAX) DECLARE @hr INT DECLARE @src NVARCHAR(255) DECLARE @desc

问题 The following code always prints the argument passed in to parameter a , regardless of the presence of a variable with the same name. Presumably because parameter identifiers are bound separately to variables in scope. Where are they positioned? Are they in the lexical environment? function foo(a, b = () => a) { var a = 1 console.log(b()) } foo() // undefined foo(2) // 2 Is it that var declarations end up in the special VariableEnvironment, while parameters are positioned in the