Method isSparse

src/main/java/org/dynjs/runtime/Types.java:379–393

(ExecutionContext context, JSObject o)

    }

    public static boolean isSparse(ExecutionContext context, JSObject o) {
        if (!o.hasProperty(context, "length")) {
            return false;
        }

        long len = Types.toUint32(context, o.get(context, "length"));

        for (long i = 0; i < len; ++i) {
            if (o.getOwnProperty(context, "" + i, false) == Types.UNDEFINED) {
                return true;
            }
        }

        return false;
    }

    public static Object getValue(ExecutionContext context, Object o) {
        if (o instanceof Reference) {