Function Append

json/json.go:196–216

Append acts like Marshal but appends the json representation to b instead of always reallocating a new slice.

(b []byte, x any, flags AppendFlags)

// Append acts like Marshal but appends the json representation to b instead of
// always reallocating a new slice.
func Append(b []byte, x any, flags AppendFlags) ([]byte, error) {
	if x == nil {
		// Special case for nil values because it makes the rest of the code
		// simpler to assume that it won't be seeing nil pointers.
		return append(b, "null"...), nil
	}

	t := reflect.TypeOf(x)
	p := (*iface)(unsafe.Pointer(&x)).ptr

	cache := cacheLoad()
	c, found := cache[typeid(t)]

	if !found {
		c = constructCachedCodec(t, cache)
	}

	b, err := c.encode(encoder{flags: flags}, b, p)
	runtime.KeepAlive(x)
	return b, err
}

// Escape is a convenience helper to construct an escaped JSON string from s.
// The function escales HTML characters, for more control over the escape