JavaScript NodeJS best practices with Promises nodejs best practices github,node js best practices 2019,node

I am developing a new library above amqp.node (amqplib), basically we dont need all the RabbitMQ functionality. So, I am creating a simple library that facilitates the usage specifically for our project.

This new library will return Promises. So, for example, subscribing to a queue will return a Promise about Ok and Error. But, what should I do with later issues? Disconnect, reconnect, Queue deleted, etc, etc? This will happen after the promise has been resolve. Should my new class emit his own errors? Is this a good way of working with promises?

Answer:1

Promises are one shot devices. So, they are only the right design tool for a one time state transition. Once they've been resolved or rejected, they are locked into that state. After that, you either have to have new promises for new operations or promises aren't really the right scheme and you'd rather have something like event notification.

So, if you can have a disconnect, then a reconnect, then a disconnect, etc... you'll either have to create a new promise for each state transition or promises aren't really the simplest implementation and what you really want is just an ability to subscribe listeners to various events (derive from an eventEmitter and emit interesting events that others can listen to).

I don't claim to understand exactly what you're trying to build, but several parts of your description sound like maybe you want more of an event notification scheme for much of your project instead of promises.

FYI, here are some interesting articles on the different notification schemes:

Callbacks, Promises, Signals and Events

JavaScript Asynchronous Architectures: Events vs. Promises

Event Emitter, Pub Sub or Deferred Promises … which should you choose?

Answer:2

I found a nice script to highlight html table rows and it works fine : http://nerds-central.blogspot.ca/2006/12/selectable-table-rows-with-html-and.html I changed the onclick event for onmouseover ...

I found a nice script to highlight html table rows and it works fine : http://nerds-central.blogspot.ca/2006/12/selectable-table-rows-with-html-and.html I changed the onclick event for onmouseover ...

  1. highlight html table row
  2. highlight html table row onclick
  3. highlight html table row onclick javascript
  4. highlight html table column
  5. html highlight table cell on hover
  6. html highlight table cell
  7. html highlight table row on hover
  8. highlight table html
  9. html highlight table cell onclick
  10. html highlight table row on click
  11. html highlight table column mouse over
  12. html highlight table data
  13. html highlight table row mouseover
  14. html highlight table header
  15. html highlight selected table row
  16. highlight text in html table
  17. html table highlight row and column on hover
  18. html table highlight every other row
  19. highlight selected row in html table jquery
  20. html table highlight selected cell

I have several divs as follows in my HTML code: <div>#558C89</div> and I want the background of the every div to have the value it holds. I came up with a script that does that, but only ...

I have several divs as follows in my HTML code: <div>#558C89</div> and I want the background of the every div to have the value it holds. I came up with a script that does that, but only ...

  1. background color text html
  2. background color text css
  3. background color text photoshop
  4. background color text illustrator
  5. background color text box indesign
  6. background color text word
  7. background color text indesign
  8. background color text box canva
  9. background color text autocad
  10. background color text box photoshop
  11. background color text box tableau
  12. background color text box illustrator
  13. background color text instagram story
  14. background color text block mailchimp
  15. background color text field flutter
  16. background color text latex
  17. background color text flutter
  18. background color text box html
  19. background color text color
  20. background color text gimp

I'm attempting to scrape a <script> tag from a set of webpages using Simple HTML Dom. At first, I was scraping it by providing the numerical order of the tag I needed: $script = $html->find('...

I'm attempting to scrape a <script> tag from a set of webpages using Simple HTML Dom. At first, I was scraping it by providing the numerical order of the tag I needed: $script = $html->find('...

  1. scraping tutorial with r
  2. scraping script for
  3. php scraping script with curl

I will try to be as specific as I can. So I need to create a selector that filters the options. I have: types of cars The places where you can drive those cars. So for example you would select > ...

I will try to be as specific as I can. So I need to create a selector that filters the options. I have: types of cars The places where you can drive those cars. So for example you would select > ...

  1. html javascript select option
  2. html javascript select onchange
  3. html javascript select value
  4. html javascript select option onclick
  5. html javascript select
  6. html javascript select option value
  7. html javascript select add option
  8. html javascript select text
  9. html javascript select onchange value
  10. html javascript select element
  11. html javascript select all checkboxes
  12. html javascript select change event
  13. html javascript select event
  14. html javascript select file
  15. html javascript select remove all options
  16. html javascript select row in table
  17. html javascript select directory
  18. html select onchange javascript
  19. html javascript select multiple
  20. html javascript select option text