This content originally appeared on DEV Community and was authored by John Leo Claudio
Go lets you create your own data type using structs. If you're coming from TypeScript, you can think of it like an interface where you declare your fields and specify each type.
type User struct {
name string
age int
}
To access values, use dot notation. Here's an example to use it:
// variable user1 is now a type User
user1 := User{
name: "Scott",
age: 23,
}
// Display the values:
fmt.Println("Name", user1.name)
fmt.Println("Age", user1.age)
Here are some gotchas:
type bob struct {
name string
age int
}
type annie struct {
name string
age int
}
var b bob
var a annie
b = a // <- cannot use a (variable of type annie) as bob value in assignment
Although the bob and annie structs have the same fields, assigning the variable b with a won't work because Go doesn't do implicit conversion .
You CAN assign a to b though, using explicit conversion
b = bob(a)
What do you think will happen in the code below? Will the compiler complain?
user2 := struct {
name string
age int
}{
name: "Ishin",
age: 72,
}
b = user2
a = user2
Surprisingly, the code above works. Why this works and not the previous one? It's because variable a was a named type and variable user2 is a literal type.
Key Takeaways:
- Structs lets you create your own data type
- Use
explicitconversion to assign values with same memory footprint
This content originally appeared on DEV Community and was authored by John Leo Claudio
John Leo Claudio | Sciencx (2021-03-09T14:56:38+00:00) Go Struct. Retrieved from https://www.scien.cx/2021/03/09/go-struct/
Please log in to upload a file.
There are no updates yet.
Click the Upload button above to add an update.