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I want to assign default value for struct field in Go. I am not sure if it is possible but while creating/initializing object of the struct, if I don't assign any value to the field, I want it to be assigned from default value. Any idea how to achieve it?
type abc struct {
prop1 int
prop2 int // default value: 0
}
obj := abc{prop1: 5}
// here I want obj.prop2 to be 0
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Default values can be assigned to a struct by using a constructor function. Rather than creating a structure directly, we can use a constructor to assign custom default values to all or some of its members. Another way of assigning default values to structs is by using tags.
When we define a struct (or class) type, we can provide a default initialization value for each member as part of the type definition. This process is called non-static member initialization, and the initialization value is called a default member initializer.
"A struct cannot have a destructor. A destructor is just an override of object.
This is not possible. The best you can do is use a constructor method:
type abc struct {
prop1 int
prop2 int // default value: 0
}
func New(prop1 int) abc {
return abc{
prop1: prop1,
prop2: someDefaultValue,
}
}
But also note that all values in Go automatically default to their zero value. The zero value for an int is already 0. So if the default value you want is literally 0, you already get that for free. You only need a constructor if you want some default value other than the zero value for a type.
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