ErrataEloquent JavaScript, 3rd Edition
These are the known mistakes in the third edition of the book. For errata in the first edition, see this page. For the second edition, see this page. To report a problem that is not listed here, send me an email.
Issues whose page number is followed by an ordinal number are only present up to the print denoted by that number. I.e. those followed by “1st” were fixed in the second print.
Chapter 2
Page 34 (1st) Updating Bindings Succintly: Where it
says counter- it should be counter--.
Chapter 5
Page 91 (3rd) Composability: Due to an initial mistake in the script data set, the results of the computations on this page differ from the ones with the current, corrected data. The average year for living scripts should be 1165, the average for non-living scripts should be 204.
Chapter 6
Page 111 (2nd) Inheritance: In the second
paragraph below the example code, instead of “content
method”, the text should say “element function”.
Chapter 8
Page 134 (2nd) Error Propagation: In the third
paragraph of the section, a function promptInteger is
referred to. The function is actually
called promptNumber, and the word “whole” should be
dropped from the sentence (it accepts non-whole numbers, too).
Chapter 10
Page 168 (1st) Modules as Building Blocks: In “each needs it own private scope“, it should say “its own private scope“.
Chapter 11
Page 189/190 (4th) Networks are Hard: The text
under the code that defines request claims the function
will give up after four attempts and a second. In fact, it gives up
after three attempts, in three-quarter second.
Chapter 14
Page 231 (5th) Moving Through the Tree: Below
the code example, the text claims
that for/of loops don't work on DOM child
lists. But in current (even as of the book's release) browsers they
do.
Page 234 (2nd) Creating Nodes: In the code, “edition” is misspelled as “editon”.
Chapter 15
Page 255 (7th) Mouse Motion: The second
paragraph on the page claims that you can isolate a button from
the buttons bitmask with the remainder operator, but that
doesn't really work (you'd also need a division and a floor, which
gets too obscure to go into in this chapter).
Page 258 (3rd) Load Event: The description of
the beforeunload claims that you just need to return a
string from your event handler. For handlers registered
with addEventListener you, in fact, need to
call preventDefault and set a returnValue
property to get the warn-on-leave behavior.
Chapter 16
Page 271 (8th) Actors: Near the bottom of the page, the book incorrectly uses the term phase (of a sinus wave) where it should say period.
Page 278 (8th) Motion and Collision: The code
that defines the touches method unintentionally (though
harmlessly) used var instead of let to
define variables.
Page 285 (2nd) Pausing the Game: The text
refers to the arrow binding, where it should
say arrowKeys.
Chapter 19
Page 336 (5th) The State: The text mentions the
property fillColor where it should
say fillStyle instead.
Chapter 20
Page 367 (10th) A File Server: The part that talks about “the output stream to the request” should say “the stream from the request” instead.
Page 369 (1st) Directory
Creation: MKCOL stands for “make collection”, not “make
column” as the book claims.
Chapter 21
Page 373 (3rd) HTTP Interface: There is a superfluous closing brace at the end of the example JSON snippet.
Exercise Hints
Page 414 (3rd) A Modular Robot:
The dijkstrajs package name is misspelled
as dijkstajs.