forbes at lindesay.co.uk (2013-08-23T13:01:10.266Z)
Thanks for your answers.
Domenic Denicola sent me an example by email, but I don't understand it all.
I waited for his response, but seemed busy, I turn back to you.
The sample :
```js
function postToMailingList({
email = '[email protected]',
subject = 'Optional Named Arguments',
from = '[email protected]'} = {}) {
console.log(email, subject, from)
}
postToMailingList() //uses all the defaults
postToMailingList({})//exactly the same
postToMailingList({email: '[email protected]'})//overrides the default e-mail
```
[view in traceur](http://traceur-compiler.googlecode.com/git/demo/repl.html#function%20postToMailingList%28{%0A%20%20%20%20email%20%3D%20%22es-discuss%40mozilla.org%22%2C%0A%20%20%20%20subject%20%3D%20%22Optional%20named%20arguments%22%2C%0A%20%20%20%20from%20%3D%20%22michael.rouges%40gmail.com%22}%20%3D%20{}%29%20{%0A%20%20console.log%28email%2C%20subject%2C%20from%29%3B%0A}%0A%0ApostToMailingList%28%29%3B%20%2F%2F%20uses%20all%20the%20defaults%0ApostToMailingList%28{}%29%3B%20%2F%2F%20same%0ApostToMailingList%28{%20email%3A%20%22public-script-coord%40w3.org%22%20}%29%3B%20%2F%2F%20overrides%20the%20default%20email)
Several points seems obscure:
- the `=` operator in the option object declaration
- the role of `= {}` inside the parentheses of the function declaration
- and the fact that you can decide to have an empty object, despite
defaults *(line 9)*
Could you enlighten me, please? or advise me of an article on this subject?
Thanks in advance.
Hi all, Thanks for your answers. Domenic Denicola sent me an example by email, but I don't understand it all. I waited for his response, but seemed busy, I turn back to you. The sample : http://traceur-compiler.googlecode.com/git/demo/repl.html#function%20postToMailingList%28{%0A%20%20%20%20email%20%3D%20%22es-discuss%40mozilla.org%22%2C%0A%20%20%20%20subject%20%3D%20%22Optional%20named%20arguments%22%2C%0A%20%20%20%20from%20%3D%20%22michael.rouges%40gmail.com%22}%20%3D%20{}%29%20{%0A%20%20console.log%28email%2C%20subject%2C%20from%29%3B%0A}%0A%0ApostToMailingList%28%29%3B%20%2F%2F%20uses%20all%20the%20defaults%0ApostToMailingList%28{}%29%3B%20%2F%2F%20same%0ApostToMailingList%28{%20email%3A%20%22public-script-coord%40w3.org%22%20}%29%3B%20%2F%2F%20overrides%20the%20default%20email Several points seems obscure: - the *=* operator in the option object declaration - the role of *= {}* inside the parentheses of the function declaration - and the fact that you can decide to have an empty object, despite defaults *(line 9)* Could you enlighten me, please? or advise me of an article on this subject? Thanks in advance. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.mozilla.org/pipermail/es-discuss/attachments/20130823/b01ac93c/attachment.html>