groupPrimitives method
Implementation
groupPrimitives(List primitives ) {
final Map<String,dynamic> build = {};
for (int i = 0; i < primitives.length; i ++ ) {
final primitive = primitives[ i ];
if ( build[ primitive['type'] ] == null ) build[ primitive['type'] ] = [];
build[ primitive['type'] ].add( primitive );
}
return build;
}