mapOrNull<TResult extends Object?> method

  1. @optionalTypeArgs
TResult? mapOrNull<TResult extends Object?>({
  1. TResult? object(
    1. SchemaObject value
    )?,
  2. TResult? boolean(
    1. SchemaBoolean value
    )?,
  3. TResult? string(
    1. SchemaString value
    )?,
  4. TResult? integer(
    1. SchemaInteger value
    )?,
  5. TResult? number(
    1. SchemaNumber value
    )?,
  6. TResult? enumeration(
    1. SchemaEnum value
    )?,
  7. TResult? array(
    1. SchemaArray value
    )?,
  8. TResult? map(
    1. SchemaMap value
    )?,
})

A variant of map that fallback to returning null.

It is equivalent to doing:

switch (sealedClass) {
  case final Subclass value:
    return ...;
  case _:
    return null;
}

Implementation

@optionalTypeArgs TResult? mapOrNull<TResult extends Object?>({TResult? Function( SchemaObject value)?  object,TResult? Function( SchemaBoolean value)?  boolean,TResult? Function( SchemaString value)?  string,TResult? Function( SchemaInteger value)?  integer,TResult? Function( SchemaNumber value)?  number,TResult? Function( SchemaEnum value)?  enumeration,TResult? Function( SchemaArray value)?  array,TResult? Function( SchemaMap value)?  map,}){
final _that = this;
switch (_that) {
case SchemaObject() when object != null:
return object(_that);case SchemaBoolean() when boolean != null:
return boolean(_that);case SchemaString() when string != null:
return string(_that);case SchemaInteger() when integer != null:
return integer(_that);case SchemaNumber() when number != null:
return number(_that);case SchemaEnum() when enumeration != null:
return enumeration(_that);case SchemaArray() when array != null:
return array(_that);case SchemaMap() when map != null:
return map(_that);case _:
  return null;

}
}