nl_tokens: ------------------------------------------------------------------- Harmony Map
pl_tokens: function MapConstructor ( iterable ) { if ( IS_UNDEFINED ( new . target ) ) { throw MakeTypeError ( kConstructorNotFunction , "Map" ) ; } % _MapInitialize ( this ) ; if ( ! IS_NULL_OR_UNDEFINED ( iterable ) ) { var adder = this . <mask> ; if ( ! IS_CALLABLE ( adder ) ) { throw MakeTypeError ( kPropertyNotFunction , adder , 'set' , this ) ; } for ( var nextItem of iterable ) { if ( ! IS_RECEIVER ( nextItem ) ) { throw MakeTypeError ( kIteratorValueNotAnObject , nextItem ) ; } % _Call ( adder , this , nextItem [ 0 ] , nextItem [ 1 ] ) ; } } }