javascript - Official information on `arguments` in ES6 Arrow functions? - 


(() => console.log(arguments))(1,2,3);  // chrome, ff, node give "1,2,3" // babel gives "arguments not defined" parent scope

according babel (and can tell initial tc39 recommendations), "invalid" arrow functions should using parent scope arguments. info i've been able find contradicts single comment saying rejected tc39, can't find up.

just looking official docs here.

chrome, ff, , node seem wrong here, babel correct:

arrow functions not have own arguments binding in scope; no arguments object created when calling them.

looking official docs here

arrow function expressions evaluate functions have [[thismode]] set lexical, , when such called declaration instantiation not create arguments object. there specifc note (18 a) stating "arrow functions never have arguments objects.".


Comments

Post a Comment

Popular posts from this blog

twig - Using Twigbridge in a Laravel 5.1 Package -

i'm trying create laravel 5.1 package uses twigbridge instead of .php views. can normal .php views display fine, when try make use of .twig templates i'm met error. possible use twigbridge templates when creating views laravel package or pretty stuck blade , php ? edit 1: loading twig template without extending works. it's when start using {% extends 'file' %} error comes out. i error error loading /virtual/laravel/packages/username/mypackage/src/views/sample.twig: template "templates.master" not defined () in "/virtual/laravel/packages/username/mypackage/src/views/sample.twig" @ line 1. my folders username |_ mypackage |_ src |_ controllers - samplecontroller.php |_ views |_ templates - master.twig - sample.twig twig template sample.twig {% extends 'templates.master' %} {% block content %} {{ parent() ...
Read more

jdbc - Not able to establish database connection in eclipse -

i want make new database connection (db2) in eclipse purpose of using jpa. in jpa perspective, in data source explorer view, when try create new db connection, receive following logs when try ping server. org.eclipse.datatools.connectivity.exceptions.dbnotstartexception: no start database command issued. errorcode = -4499, sqlstate = 08001. @ org.eclipse.datatools.enablement.ibm.db2.internal.luw.jdbcluwjdbcconnection.getconnectexception(jdbcluwjdbcconnection.java:74) @ org.eclipse.datatools.connectivity.ui.pingjob.gettestconnectionexception(pingjob.java:81) @ org.eclipse.datatools.connectivity.ui.pingjob.run(pingjob.java:63) @ org.eclipse.core.internal.jobs.worker.run(worker.java:54) caused by: com.ibm.db2.jcc.am.ro: [jcc][t4][2043][11550][4.8.87] exception java.net.connectexception: error opening socket server example.example.com/51.37.93.117 on port 50,000 message: connection timed out: connect. errorcode=-4499, sqlstate=08001 @ com.ibm.db2.jcc.am.gd.a(gd.j...
Read more

Kivy: Swiping (Carousel & ScreenManager) -

i have 2 screens in screenmanager both contains number of buttons in scrollview. idea 1 steps forward (right) clicking button. , step (left) swiping back. trying add carousel implement 1 swipe on second page. have tried: self.root = screenmanager(id = 'screen_manager') main_screen = screen(name = 'main_screen') scroller = scroller() button_text = ['teach', 'move', 'b3', 'b4', 'b5', 'b6', 'b7', 'b8'] text in button_text: scroller.view.add_widget(field(name=text, direction='left', current='teach')) main_screen.add_widget(scroller) self.root.add_widget(main_screen) carousel = carousel(direction='left', id='carousel') teach = screen(name = 'teach') scroller2 = scroller() button_text = ['vocab', 'drills'] text in button_text: scroller2.view.add_widget(field(name=text, direction='right', current='main_screen')) carousel.add_...
Read more