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A book series on JavaScript. @YDKJS on twitter.

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Fixes [#948](https://github.com/getify/You-Dont-Know-JS/issues/948)

for second edition

It should be a ReferenceError. \_(:3」∠)\_

for second edition

**Yes, I promise I've read the [Contributions Guidelines](CONTRIBUTING.md)** (please feel free to remove this line).

for second edition

without lack of clear understanding --> without LUCK of clear understanding || WITH lack of clear understanding || :something like that: Even though I made a correction, probably it will...

for second edition

The ECMAScript language types quotation is missing Symbol Type. I have updated quotation from Ecma-262 Edition 5.1 to 7.0 and updated the link

for second edition

Lines 1540 through 1573 refer to the module with "foo" as "A" and the module with "bar" as "B". Lines 1580 through 1605 should match these names, rather than referring...

for second edition

I think that is the proper description? Not `length` bytes, but rather `length` elements initialized to 0.

for second edition

#734 was confirmed as typo, so I am sending a pull request with the tiny change :)

for second edition

I think this will help JS developers from getting false when they're expecting true

for second edition