Golang, variable with type from string

Question

Is it possible to create variable with type from string?

Example:
I have two types:

type FirstType struct {
    ...
}

type SecondType struct {
    ...
}

// also I have a string variable
var1 := "Second"

I want to create variable with type - String value + "Type":

var variable = []var1+"Type" // slice of "SecondType"

Expected result is like in this case:

var variable = []SecondType

Thanks!

fuz · Accepted Answer · 2014-10-25 19:14:35Z

7

This is not possible. Go does not provide functionality to create variables of types that are not known statically. The type of a variable is always known statically. Consider using interfaces instead.

answered Oct 25, 2014 at 19:14

fuz

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4 Comments

GioGio Over a year ago

Suppose you have an interface IEvent, and a lot of different implementations of it. You can serialize them into the same object with properties Type and Data, but how would you deserialize them without having a very long switch case operation?

fuz Over a year ago

@GioGio Try to avoid this sort of situation. One solution is to have a Deserialize() method in the interface implemented by each implemention to deserialize the IEvent in according to its specific type.

GioGio Over a year ago

I'm confused, do you mean a Deserialize() on the IEvent interface? How can it be called if we don't have an instance of IEvent yet? I might be missing some important detail

fuz Over a year ago

@GioGio Ah sorry, I misunderstood. For deserialisation, you could use an array or hash map of decoding functions instead of a switch statement.

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