Unmarshal decodes the first document found within the in byte slice and assigns decoded values into the out value.

Maps and pointers (to a struct, string, int, etc) are accepted as out values. If an internal pointer within a struct is not initialized, the yaml package will initialize it if necessary for unmarshalling the provided data. The out parameter must not be nil.

The type of the decoded values should be compatible with the respective values in out. If one or more values cannot be decoded due to a type mismatches, decoding continues partially until the end of the YAML content, and a *yaml.TypeError is returned with details for all missed values.

Struct fields are only unmarshalled if they are exported (have an upper case first letter), and are unmarshalled using the field name lowercased as the default key. Custom keys may be defined via the "yaml" name in the field tag: the content preceding the first comma is used as the key, and the following comma-separated options are used to tweak the marshalling process (see Marshal). Conflicting names result in a runtime error.

For example:

type T struct {
    F int `yaml:"a,omitempty"`
    B int
var t T
yaml.Unmarshal([]byte("a: 1\nb: 2"), &t)

See the documentation of Marshal for the format of tags and a list of supported tag options.

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