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The latest version of the book is P1.0, released 11 months ago. If you've bought a PDF of the book and would like to update it to this version (for free), visit your home page.

By default this page displays the errata for the latest version of the book. If you have a previous version, select it here:

If you've found a new error, please submit it.

  • Typo
  • Tech. error
  • Suggestion
  • Maybe next edition
  • Not a problem
  • Reported in: P1.0 (24-Apr-19)
#84975
Paper page: 1
Cant use the server! PS D:\_current tutorial\rkrxjs-code\asset-server> npm -v 6.9.0 PS D:\_current tutorial\rkrxjs-code\asset-server> node -v v1...more...
  • Reported in: P1.0 (13-Dec-18)
#84144
PDF page: 10
Off-by-one error in the stopwatch example. The line map(item => (item / 10)), should read map(item => ((item + 1) / 10)), Otherwise the s...more...
  • Reported in: P1.0 (12-Nov-19)
#85999
PDF page: 20
The code snippet: “ ​  ​let​ keyUp$ = fromEvent(textbox, ​'keyup'​) ​  .pipe( ​  map(event => event.target.value), ​  map(wordString => wor...more...
  • Reported in: P1.0 (13-Dec-18)
#84141
PDF page: 37

Where it says 'mosaic.js' it should say 'mosaic.ts'--Jesus Rodriguez