description

# newInstance method Null safety

InstanceMirror newInstance (

1. Symbol constructorName,
2. List positionalArguments,
3. [Map<Symbol, dynamic> namedArguments = const <Symbol, dynamic>{}]

)

Invokes the named constructor and returns a mirror on the result.

Let c be the class reflected by this mirror, let a1, ..., an be the elements of `positionalArguments`, let k1, ..., km be the identifiers denoted by the elements of `namedArguments.keys`, and let v1, ..., vm be the elements of `namedArguments.values`.

If `constructorName` was created from the empty string, then this method will execute the instance creation expression new c(a1, ..., an, k1: v1, ..., km: vm) in a scope that has access to the private members of c.

Otherwise, let f be the simple name of the constructor denoted by `constructorName`. Then this method will execute the instance creation expression new c.f(a1, ..., an, k1: v1, ..., km: vm) in a scope that has access to the private members of c.

In either case:

- If the expression evaluates to a result r, this method returns the result of calling reflect(r).
- If evaluating the expression causes a compilation error, the effect is the same as if a non-reflective compilation error had been encountered.
- If evaluating the expression throws an exception e (that it does not catch), this method throws e.

## Implementation

    InstanceMirror newInstance(
        Symbol constructorName, List<dynamic> positionalArguments,
        [Map<Symbol, dynamic> namedArguments = const <Symbol, dynamic>{}]);