I'm making my way through Professional Javascript for Web Developers and found a discrepancy.

[Avjinder Sekhon]

In Chapter 3, Language Basics, Understanding Argument section, Page 82,  it's mentioned that if any value in the arguments object is modified, it's also reflected in the named argument. But, if the value of the named argument is modified, the corresponding value is not changed in the arguments object.

However, this is not the case now as I've tested it on multiple browsers. The values in the named arguments and the arguments object are being kept in sync, no matter which one is modified. Can you let me if that's true or not.

Also, while I love your book so far, do you think it's appropriate to use this to learn Javascript now, as I assume many things in the language must have changed since the book was published?

[Nicholas Zakas]

The arguments object and named parameters are kept in sync in nonstrict mode. In strict mode, they are decoupled as described. This is mentioned on the errata page: http://www.wrox.com/WileyCDA/WroxTitle/Professional-JavaScript-for-Web-Developers-3rd-Edition.productCd-1118026691,descCd-ERRATA.html

The book is fine to learn from, everything is still relevant aside from the E4X chapter. I'd suggest following up by reading Understanding ECMAScript 6 to get the newer parts covered.

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[Avjinder Sekhon]

Thank you for replying so quickly. Loving the book btw. Thanks.