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JavaScript Promises Explained By Gambling At A Casino

Kevin Kononenko on September 11, 2018

If you have ever gambled or watched a movie about gambling, then you can understand promises in JavaScript. We all love the asynchronous capabilit...

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Angel Daniel Munoz Gonzalez • Sep 12 '18 • Edited

Thank you for not using new Promise(); Multiple times, just once and then (badum tss) just chaining .then() that's how promises should be used.

I've seen so many tutorials around using/abusing new Promise(); when .then() already returns promises.

Edit:
I think I was not clear, bright explanation I really liked the reading and your example! keep writing more stuff!

Kevin Kononenko • Sep 12 '18

Haha I appreciate it Angel! Definitely clear.

Arit Developer • Apr 28 '19

This was an awesomely REFRESHING walkthrough! Now you've got me excited about Promises! Thank you so much for taking the time and effort to produce this intelligent, visually-appealing post! I shall take a page from your book as I start writing my own tutorials :D

Kevin Kononenko • Apr 28 '19

Thanks Arit :)

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Rafael E. • Sep 12 '18

at some point you stopped using slotResults and started using ticketValue but kept validating slotResults.

Kevin Kononenko • Sep 13 '18

Hey Rafael, can you point to a specific code block? I will check it out.

Rafael E. • Sep 13 '18

Sure!

All the code blocks after the paragraph named "Using Objects Within Promises"

withdraw.then(function(amount){
  let ticketValue = playSlots(amount, 100);

  if(slotResults <= 0) <---- HERE 
    throw err;

  return {tickets: ticketValue, cash: amount};
});

perhaps it should be something like

if((ticketValue + amount) <= 0)
    throw err;

or validate them separately in case you could use just tickets even if amount is <= 0.

Kevin Kononenko • Sep 14 '18

Good point! Just fixed two cases.

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TomWhite1122 • Dec 1 '20

Good one! I'm running online casino sites.google.com/ so it was quite helpful for me.
How many years are you coding? Because I would never write a code like this by myself. Anyway thanks for the code and good explanation!

worldforcrack • Jan 25 '22

If you have ever gambled or watched a movie about gambling, then you can understand promises in JavaScript.

We all love the asynchronous capabilities of JavaScript. In fact, we love them so much that sometimes, we overindulge. i am also watching for some javascripts for my blog worldforcrack.com/

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