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Secrets of the JavaScript Ninja 2nd Ed: What is now obsolete/old/wrong in 1st Ed.?

 
Greenhorn
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Sure, everyone is curious to know what new topics are covered in this new Second Edition.   I'm curious to know: what sections in the First Edition (2013) are now obsolete or otherwise superseded in some way by the 2nd Edition, such that I ought to grab a big ol' marker and draw 'X's over them?
 
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Nothing. The second edition adds more explanations of how JavaScript fundamentally works -- especially some very helpful details of how the execution context operates -- along with updates for ES6 and ES7. Everything in the 1st edition is still viable and valuable.

Except for the with clause; never use that -- but first edition tells you not to use it anyways, so even that's still OK.
 
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