operator [] method
Implementation
Subject<V> operator [](K key) {
return context.nest(
() => prefixFirst('contains a value for ', literal(key)), (actual) {
if (!actual.containsKey(key)) {
return Extracted.rejection(
which: prefixFirst('does not contain the key ', literal(key)));
}
return Extracted.value(actual[key] as V);
});
}