Why Does `yaml.Unmarshal()` Return an Empty Struct in Go?

Unmarshaling YAML into Go Struct

In Go, the yaml.Unmarshal() function is used to parse YAML data into a structured representation, such as a struct. However, when trying to parse YAML data into a struct, an empty struct is returned for unknown reasons.

The solution lies in the visibility of the struct's fields. By default, struct fields are unexported, meaning they can only be accessed within the package where the struct is defined. To unmarshal YAML data into a struct, the fields must be exported.

To export fields in a Go struct, capitalize the first letter of the field name. For example, instead of:

type Config struct {
    foo_bar string
}

Use:

type Config struct {
    FooBar string
}

This makes the FooBar field exported and allows it to be accessed from outside the package. After making this change, yaml.Unmarshal() can successfully parse the YAML data into the struct.

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