JSVariable x = f.parameter("x");
JSVariable y = f.parameter("y");
JSFunctionBody body = f.getBody();
JSBlock assignmentExpressions = body.block();
assignmentExpressions.expression(x.assign(y));
assignmentExpressions.expression(x.mulAssign(y));
assignmentExpressions.expression(x.divAssign(y));
assignmentExpressions.expression(x.modAssign(y));