diff options
Diffstat (limited to 'src/encoding')
| -rw-r--r-- | src/encoding/json/decode.go | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/src/encoding/json/decode.go b/src/encoding/json/decode.go index ef08b0c274..6dc1b9d5b6 100644 --- a/src/encoding/json/decode.go +++ b/src/encoding/json/decode.go @@ -48,12 +48,22 @@ import ( // map[string]interface{}, for JSON objects // nil for JSON null // -// To unmarshal a JSON array into a slice, Unmarshal resets the slice to nil -// and then appends each element to the slice. +// To unmarshal a JSON array into a slice, Unmarshal resets the slice length +// to zero and then appends each element to the slice. +// As a special case, to unmarshal an empty JSON array into a slice, +// Unmarshal replaces the slice with a new empty slice. // -// To unmarshal a JSON object into a map, Unmarshal replaces the map -// with an empty map and then adds key-value pairs from the object to -// the map. +// To unmarshal a JSON array into a Go array, Unmarshal decodes +// JSON array elements into corresponding Go array elements. +// If the Go array is smaller than the JSON array, +// the additional JSON array elements are discarded. +// If the JSON array is smaller than the Go array, +// the additional Go array elements are set to zero values. +// +// To unmarshal a JSON object into a string-keyed map, Unmarshal first +// establishes a map to use, If the map is nil, Unmarshal allocates a new map. +// Otherwise Unmarshal reuses the existing map, keeping existing entries. +// Unmarshal then stores key-value pairs from the JSON object into the map. // // If a JSON value is not appropriate for a given target type, // or if a JSON number overflows the target type, Unmarshal |