You can declare it like this: CREATE PROCEDURE MyProcName @Parameter1 INT = 1, @Parameter2 VARCHAR (100) = ‘StringValue’, @Parameter3 VARCHAR (100) = NULL AS /* Check for the NULL / default value (indicating nothing was passed) */ if (@Parameter3 IS NULL) BEGIN /* Whatever code you desire for a missing parameter */ INSERT INTO …….. … Read more
1. Using default implementations (preferred). protocol MyProtocol { func doSomething() } extension MyProtocol { func doSomething() { /* return a default value or just leave empty */ } } struct MyStruct: MyProtocol { /* no compile error */ } Advantages No Objective-C runtime is involved (well, no explicitly at least). This means you can conform … Read more
Good doc from PyCon a couple years back – Default parameter values explained. But basically, since lists are mutable objects, and keyword arguments are evaluated at function definition time, every time you call the function, you get the same default value. The right way to do this would be: def F(a, b=None): if b is … Read more
Why can’t you use function overloading? Surely it’s the easiest solution to your problem? void foo(double &bar, double &foobar) { bar = 100; foobar = 150; } void foo(double &bar) { double foobar = 0.0; foo(bar, foobar); }
Use the Optional keyword and supply a default value. Optional parameters must be the last parameters defined, to avoid creating ambiguous function signatures. Sub MyMethod(ByVal Param1 As String, Optional ByVal FlagArgument As Boolean = True) If FlagArgument Then ‘Do something special Console.WriteLine(Param1) End If End Sub Call it like this: MyMethod(“test1”) Or like this: MyMethod(“test2”, … Read more
Apparently not using automatic injection. However, you can inject the injector and check for the service: myApp.controller(‘MyController’, [ ‘$scope’, ‘$injector’, ‘firstRequiredService’, ‘secondRequiredService’, function ($scope, $injector, firstRequiredService, secondRequiredService) { if ($injector.has(‘firstOptionalService’)) { var firstOptionalService = $injector.get(‘firstOptionalService’); } } ]);
If this is C# 4.0, you can use named arguments feature: foo(x: 5, optionalZ: 8); See this blog for more information.
This is not that obvious I’ve read some comments of why undefined is completely different than null and that’s why it explains the current behavior of default parameters. One could argue that explicitly passing undefined should not trigger the default value substitution because when I have a function: const f = (x = ‘default’) => … Read more
Check the $PSCmdlet variable: $PSCmdlet.ParameterSetName
Can’t be done as it stands… The code def myMethod(pParm1=’1′, pParm2=’2′){ println “${pParm1}${pParm2}” } Basically makes groovy create the following methods: Object myMethod( pParm1, pParm2 ) { println “$pParm1$pParm2” } Object myMethod( pParm1 ) { this.myMethod( pParm1, ‘2’ ) } Object myMethod() { this.myMethod( ‘1’, ‘2’ ) } One alternative would be to have an … Read more