Styjun

How to help my 2.5-year-old daughter take her medicine when she refuses to?

Do any aircraft carry boats?

Renewed US Passport, Did Not Receive Expired US Passport

Contract Employer Keeps Asking for Small Things Without Pay

My favorite color is blue what is your favorite color?

Can I say "I have encrypted something" if I hash something?

Is it appropriate for a professor to require students to sign a non-disclosure agreement before being taught?

Gas pipes - why does gas burn "outwards?"

Why didn't Thor use the All powerful spear instead of Stormbreaker?

Have there been any countries that voted themselves out of existence?

Where does the expression "triple-A" comes from?

Random point on a sphere

Are Co2 tire cartridges reusable for multiple tires?

Dividing Divisive Divisors

How can a resurrection system prevent the cheapening of death?

Are there any instances of members of different Hogwarts houses coupling up and marrying each other?

What does "synoptic" mean in avionics?

How do email clients "send later" without storing a password?

Writing a worded mathematical expression

How could a imperial dynasty keep a loose collection of pirates, raiders, etc unified?

Kingdom Map and Travel Pace

Is BitLocker useful in the case of stolen laptop?

Why does F + F' = 1?

Does the wording of the Wrathful Smite spell imply that there are other living beings that aren't considered "creatures"?

Difference between map and each on Promise bluebird

Bluebird Promise serial iteration, and resolve to modified array?Is there a way to use Bluebird's Promise.each concurrently?Difference between == and === in JavaScriptWhat's the difference between using “let” and “var”?What is the difference between call and apply?For-each over an array in JavaScript?Differences between lodash and underscoreWhat is the difference between Bower and npm?How do I convert an existing callback API to promises?How do I access previous promise results in a .then() chain?What is the difference between Promises and Observables?Difference between `return await promise` and `return promise`

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;

0

What would be the difference between doing these two things:

Promise.map(myValues, async myValue => 
 const owner = await findOwner(myValue);
 return Promise.all([sendMessage(owner), sendMessageSpecific(owner)]);
)

and

Promise.each(myValues, async myValue => 
 const owner = await findOwner(myValue);
 sendMessage(owner)
 sendMessageSpecific(owner)
)

I know both each and map return a Promise, but I can't figure out what would be the difference from a running perspective. It looks like with each there is no chance for concurrency, one promise happens after the other one, but I'm missing any other big differences between these two code snippets?

javascript promise async-await bluebird

share|improve this question

asked Mar 28 at 8:43

Hommer SmithHommer Smith

9,8864141 gold badges123123 silver badges218218 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  one difference is concurrency - but I gathered that from reading the doucmenation, same as you - also in the documentation, with each If all of the iterations resolve successfully, Promise.each resolves to the original array unmodified. - not so with map, because maping maps
  
  – Jaromanda X
  Mar 28 at 8:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Omitting the Promise.all call from sendMessage(owner) and sendMessageSpecific(owner) in the second snippet just makes it not work. This has nothing to do with each vs map though.
  
  – Bergi
  Mar 28 at 9:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  related: stackoverflow.com/a/28737038/1048572, stackoverflow.com/a/40408505/1048572
  
  – Bergi
  Mar 28 at 10:00
  

  
  
  
  

add a comment | 

0

What would be the difference between doing these two things:

Promise.map(myValues, async myValue => 
 const owner = await findOwner(myValue);
 return Promise.all([sendMessage(owner), sendMessageSpecific(owner)]);
)

and

Promise.each(myValues, async myValue => 
 const owner = await findOwner(myValue);
 sendMessage(owner)
 sendMessageSpecific(owner)
)

I know both each and map return a Promise, but I can't figure out what would be the difference from a running perspective. It looks like with each there is no chance for concurrency, one promise happens after the other one, but I'm missing any other big differences between these two code snippets?

javascript promise async-await bluebird

share|improve this question

asked Mar 28 at 8:43

Hommer SmithHommer Smith

9,8864141 gold badges123123 silver badges218218 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  one difference is concurrency - but I gathered that from reading the doucmenation, same as you - also in the documentation, with each If all of the iterations resolve successfully, Promise.each resolves to the original array unmodified. - not so with map, because maping maps
  
  – Jaromanda X
  Mar 28 at 8:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Omitting the Promise.all call from sendMessage(owner) and sendMessageSpecific(owner) in the second snippet just makes it not work. This has nothing to do with each vs map though.
  
  – Bergi
  Mar 28 at 9:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  related: stackoverflow.com/a/28737038/1048572, stackoverflow.com/a/40408505/1048572
  
  – Bergi
  Mar 28 at 10:00
  

  
  
  
  

add a comment | 

What would be the difference between doing these two things:

Promise.map(myValues, async myValue => 
 const owner = await findOwner(myValue);
 return Promise.all([sendMessage(owner), sendMessageSpecific(owner)]);
)

and

Promise.each(myValues, async myValue => 
 const owner = await findOwner(myValue);
 sendMessage(owner)
 sendMessageSpecific(owner)
)

I know both each and map return a Promise, but I can't figure out what would be the difference from a running perspective. It looks like with each there is no chance for concurrency, one promise happens after the other one, but I'm missing any other big differences between these two code snippets?

javascript promise async-await bluebird

share|improve this question

asked Mar 28 at 8:43

Hommer SmithHommer Smith

9,8864141 gold badges123123 silver badges218218 bronze badges

Promise.map(myValues, async myValue => 
 const owner = await findOwner(myValue);
 return Promise.all([sendMessage(owner), sendMessageSpecific(owner)]);
)

Promise.each(myValues, async myValue => 
 const owner = await findOwner(myValue);
 sendMessage(owner)
 sendMessageSpecific(owner)
)

share|improve this question

asked Mar 28 at 8:43

Hommer SmithHommer Smith

9,8864141 gold badges123123 silver badges218218 bronze badges

share|improve this question

asked Mar 28 at 8:43

Hommer SmithHommer Smith

9,8864141 gold badges123123 silver badges218218 bronze badges

asked Mar 28 at 8:43

Hommer SmithHommer Smith

9,8864141 gold badges123123 silver badges218218 bronze badges

asked Mar 28 at 8:43

Hommer SmithHommer Smith

9,8864141 gold badges123123 silver badges218218 bronze badges