The scope is as you would expect. The perhaps surprising thing is that the default value is only calculated once and reused, so each time you call the function you get the same list, not a new list initialized to []. The list is stored in f.__defaults__ (or f.func_defaults in Python 2.) def f(a, L=[]): … Read more
There doesn’t seem to be a standardized default value. I have the feeling the default is 0, and the timeout event left totally dependent on browser and network settings. For IE, there is a timeout property for XMLHTTPRequests here. It defaults to null, and it says the network stack is likely to be the first … Read more
You don’t have to create the default vector if you don’t use it. You just have to ensure the declaration is done outside the if block. fn accept(input: &Vec<String>) { let def; let vec = if input.is_empty() { def = vec![“empty”.to_string()]; &def } else { input }; // … do something with `vec` } Note … Read more
A declared variable can be Zero Initialized, Value Initialized or Default Initialized. In your example: Info *p = new Info(); <——- Value Initialization Info *p = new Info; <——- Default Initialization The C++03 Standard 8.5/5 aptly defines each: To zero-initialize an object of type T means: — if T is a scalar type (3.9), the … Read more
It’s still not possible.
I guess you need something like this: const MySelect = props => ( <Select {…props} value = { props.options.filter(option => option.label === ‘Some label’) } onChange = {value => props.input.onChange(value)} onBlur={() => props.input.onBlur(props.input.value)} options={props.options} placeholder={props.placeholder} /> ); #EDIT 1 : In the new version const MySelect = props => ( <Select {…props} options={props.options} onChange = … Read more
In the Python spirit of “ask for forgiveness, not permission”, here’s one way: try: b = a[4] except IndexError: b = ‘sss’
You can use application/octet-stream for unknown types. RFC 2046 states in section 4.5.1: The “octet-stream” subtype is used to indicate that a body contains arbitrary binary data.
One possible idea is to write separate constructor function //Something is the structure we work with type Something struct { Text string DefaultText string } // NewSomething create new instance of Something func NewSomething(text string) Something { something := Something{} something.Text = text something.DefaultText = “default text” return something }
This is covered in detail in a relatively popular SO question, but I’ll try to explain the issue in your particular context. When your declare your function, the default parameters get evaluated at that moment. It does not refresh every time you call the function. The reason why your functions behave differently is because you … Read more