Errata

Errata for You Don't Know JS: Types & Grammar

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The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Date Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version	Location	Description	Submitted By	Date submitted
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 42 1st code snippet	The line: b; "foo" should be: b; // "foo"	Kyle Simpson	Feb 17, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 55 1st paragraph	"can generally can" should drop the second "can" so it's just "can generally"	Kyle Simpson	Feb 13, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 55 2nd paragraph	this internal [Class]] should be: this internal [[Class]]	Kyle Simpson	Feb 15, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 55 1st paragraph	Values that are typeof of "object" should be: Values that are typeof "object"	Kyle Simpson	Feb 15, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 63 next to last paragraph	This sentence: By far the most common reason you construct a date object is to get the current Unix timestamp value (an integer number of seconds since Jan 1, 1970). Should change to: By far the most common reason you construct a date object is to get the current timestamp value (a signed integer number of milliseconds since Jan 1, 1970). Changes: * drop "Unix" * change "an" to "a signed" * change "seconds" to "milliseconds"	Kyle Simpson	Mar 07, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 91 2nd paragraph	the only value that can you can perform should be: the only value that you can perform	Kyle Simpson	Apr 07, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 92 next to last paragraph	"accross" should be "across" (no quotes)	Kyle Simpson	Mar 18, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 94, 95 several paragraphs	Please see the diff view here for the changes that need to be made: https://github.com/getify/You-Dont-Know-JS/commit/39947c7190486cbeb7f74c8ae3188d3121827971	Kyle Simpson	Mar 07, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 96 third to last paragraph	ridiulousness > ridiculousness	Kyle Simpson	May 21, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 103 third to last paragraph	"crticics" should be "critics"	Kyle Simpson	Mar 08, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 124 the last two paragraphs of the page	In both paragraphs, the word "equitable" should be "equatable".	Kyle Simpson	Aug 29, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 181 last code snippet at bottom	This line: this[this.length-1] = item; Should be: this[this.length] = item;	Kyle Simpson	Mar 15, 2015
, Printed, PDF, ePub, Mobi, , Other Digital Version	Page 182 code snippet at bottom	This line: this[this.length-1] = item; Should be: this[this.length] = item;	Kyle Simpson	Mar 15, 2015