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Convert promise function to async/await

Is there an “exists” function for jQuery?How can I convert a string to boolean in JavaScript?var functionName = function() vs function functionName() Set a default parameter value for a JavaScript functionConvert JS object to JSON stringHow and when to use ‘async’ and ‘await’How do I convert an existing callback API to promises?What is the difference between Promises and Observables?Using async/await with a forEach loopis this Promise to async convertion correct and why await is not necessary?

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-2

I am trying to convert this function to async/await. But got confused. Is there a way to do it?

const csv = require('fast-csv');
const inputFileFolder = 'upload';

 const readData = (inputFileName) => 
 const csvData = [];

 return new Promise((resolve, reject) => 
 csv
 .fromPath(`$inputFileFolder/$inputFileName`)
 .on('data', (data) => 
 csvData.push(data);
 )
 .on('end', () => 
 resolve(csvData);
 )
 .on('error', () => 
 reject(new Error('Something went wrong while reading the CSV file.'));
 );
 );
 ;

javascript node.js promise async-await

share|improve this question

edited Mar 27 at 3:55

Shaolin

asked Mar 27 at 3:50

ShaolinShaolin

1,89633 gold badges2525 silver badges3434 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  what's the question?
  
  – Rafael
  Mar 27 at 3:52
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can't use async/await with that - you need to use it within the function that is handling the promise.
  
  – Jack Bashford
  Mar 27 at 3:52
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I guess you could await new Promise instead of return new Promise but that doesn't really accomplish anything useful - per @Jack, if you want to use await with it, use await in the consumer of readData
  
  – CertainPerformance
  Mar 27 at 3:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @JackBashford I do it. But was wondering if I can make this async/await.
  
  – Shaolin
  Mar 27 at 3:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why? "making it async/await" you'll still need to "promisify" csv.fromPath - async await is not used to make callback style code into Promise style code - is is, as has already been said twice, used for the consumer of Promises
  
  – Jaromanda X
  Mar 27 at 4:00
  
  

  
  
  
  

add a comment | 

-2

I am trying to convert this function to async/await. But got confused. Is there a way to do it?

const csv = require('fast-csv');
const inputFileFolder = 'upload';

 const readData = (inputFileName) => 
 const csvData = [];

 return new Promise((resolve, reject) => 
 csv
 .fromPath(`$inputFileFolder/$inputFileName`)
 .on('data', (data) => 
 csvData.push(data);
 )
 .on('end', () => 
 resolve(csvData);
 )
 .on('error', () => 
 reject(new Error('Something went wrong while reading the CSV file.'));
 );
 );
 ;

javascript node.js promise async-await

share|improve this question

edited Mar 27 at 3:55

Shaolin

asked Mar 27 at 3:50

ShaolinShaolin

1,89633 gold badges2525 silver badges3434 bronze badges

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  what's the question?
  
  – Rafael
  Mar 27 at 3:52
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can't use async/await with that - you need to use it within the function that is handling the promise.
  
  – Jack Bashford
  Mar 27 at 3:52
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  I guess you could await new Promise instead of return new Promise but that doesn't really accomplish anything useful - per @Jack, if you want to use await with it, use await in the consumer of readData
  
  – CertainPerformance
  Mar 27 at 3:54
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @JackBashford I do it. But was wondering if I can make this async/await.
  
  – Shaolin
  Mar 27 at 3:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Why? "making it async/await" you'll still need to "promisify" csv.fromPath - async await is not used to make callback style code into Promise style code - is is, as has already been said twice, used for the consumer of Promises
  
  – Jaromanda X
  Mar 27 at 4:00
  
  

  
  
  
  

add a comment | 

I am trying to convert this function to async/await. But got confused. Is there a way to do it?

const csv = require('fast-csv');
const inputFileFolder = 'upload';

 const readData = (inputFileName) => 
 const csvData = [];

 return new Promise((resolve, reject) => 
 csv
 .fromPath(`$inputFileFolder/$inputFileName`)
 .on('data', (data) => 
 csvData.push(data);
 )
 .on('end', () => 
 resolve(csvData);
 )
 .on('error', () => 
 reject(new Error('Something went wrong while reading the CSV file.'));
 );
 );
 ;

javascript node.js promise async-await

share|improve this question

edited Mar 27 at 3:55

Shaolin

asked Mar 27 at 3:50

ShaolinShaolin

1,89633 gold badges2525 silver badges3434 bronze badges

const csv = require('fast-csv');
const inputFileFolder = 'upload';

 const readData = (inputFileName) => 
 const csvData = [];

 return new Promise((resolve, reject) => 
 csv
 .fromPath(`$inputFileFolder/$inputFileName`)
 .on('data', (data) => 
 csvData.push(data);
 )
 .on('end', () => 
 resolve(csvData);
 )
 .on('error', () => 
 reject(new Error('Something went wrong while reading the CSV file.'));
 );
 );
 ;

share|improve this question

edited Mar 27 at 3:55

Shaolin

asked Mar 27 at 3:50

ShaolinShaolin

1,89633 gold badges2525 silver badges3434 bronze badges

share|improve this question

edited Mar 27 at 3:55

Shaolin

asked Mar 27 at 3:50

ShaolinShaolin

1,89633 gold badges2525 silver badges3434 bronze badges

asked Mar 27 at 3:50

ShaolinShaolin

1,89633 gold badges2525 silver badges3434 bronze badges

asked Mar 27 at 3:50

ShaolinShaolin

1,89633 gold badges2525 silver badges3434 bronze badges

2 Answers
2

active

oldest

votes

1

async..await provides syntactic sugar for then and catch promise methods to chain promises in synchronous-like manner.

Since the promise is created but not chained, the use of async..await won't improve the code. new Promise is still needed with async..await when there's no promise to chain.

share|improve this answer

edited Mar 27 at 7:22

answered Mar 27 at 7:17

Estus FlaskEstus Flask

86.8k2525 gold badges143143 silver badges262262 bronze badges

add a comment | 

-1

You can only use await if you declare it in a async function.
You can use it and then use correct error handling.
But if you want to use await you could use

async function name() 
 await // Your code here
;

share|improve this answer

answered Mar 27 at 4:08

GyzimoGyzimo

3977 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I know how to write async function. My problem was converting this particular one.
  
  – Shaolin
  Mar 27 at 4:21
  

  
  
  
  

add a comment | 

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1

async..await provides syntactic sugar for then and catch promise methods to chain promises in synchronous-like manner.

Since the promise is created but not chained, the use of async..await won't improve the code. new Promise is still needed with async..await when there's no promise to chain.

share|improve this answer

edited Mar 27 at 7:22

answered Mar 27 at 7:17

Estus FlaskEstus Flask

86.8k2525 gold badges143143 silver badges262262 bronze badges

add a comment | 

1

async..await provides syntactic sugar for then and catch promise methods to chain promises in synchronous-like manner.

Since the promise is created but not chained, the use of async..await won't improve the code. new Promise is still needed with async..await when there's no promise to chain.

share|improve this answer

edited Mar 27 at 7:22

answered Mar 27 at 7:17

Estus FlaskEstus Flask

86.8k2525 gold badges143143 silver badges262262 bronze badges

add a comment | 

async..await provides syntactic sugar for then and catch promise methods to chain promises in synchronous-like manner.

Since the promise is created but not chained, the use of async..await won't improve the code. new Promise is still needed with async..await when there's no promise to chain.

share|improve this answer

edited Mar 27 at 7:22

answered Mar 27 at 7:17

Estus FlaskEstus Flask

86.8k2525 gold badges143143 silver badges262262 bronze badges

share|improve this answer

edited Mar 27 at 7:22

answered Mar 27 at 7:17

Estus FlaskEstus Flask

86.8k2525 gold badges143143 silver badges262262 bronze badges

answered Mar 27 at 7:17

Estus FlaskEstus Flask

86.8k2525 gold badges143143 silver badges262262 bronze badges

answered Mar 27 at 7:17

Estus FlaskEstus Flask

86.8k2525 gold badges143143 silver badges262262 bronze badges

-1

You can only use await if you declare it in a async function.
You can use it and then use correct error handling.
But if you want to use await you could use

async function name() 
 await // Your code here
;

share|improve this answer

answered Mar 27 at 4:08

GyzimoGyzimo

3977 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I know how to write async function. My problem was converting this particular one.
  
  – Shaolin
  Mar 27 at 4:21
  

  
  
  
  

add a comment | 

-1

You can only use await if you declare it in a async function.
You can use it and then use correct error handling.
But if you want to use await you could use

async function name() 
 await // Your code here
;

share|improve this answer

answered Mar 27 at 4:08

GyzimoGyzimo

3977 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I know how to write async function. My problem was converting this particular one.
  
  – Shaolin
  Mar 27 at 4:21
  

  
  
  
  

add a comment | 

You can only use await if you declare it in a async function.
You can use it and then use correct error handling.
But if you want to use await you could use

async function name() 
 await // Your code here
;

share|improve this answer

answered Mar 27 at 4:08

GyzimoGyzimo

3977 bronze badges

async function name() 
 await // Your code here
;

share|improve this answer

answered Mar 27 at 4:08

GyzimoGyzimo

3977 bronze badges

answered Mar 27 at 4:08

GyzimoGyzimo

3977 bronze badges

answered Mar 27 at 4:08

GyzimoGyzimo

3977 bronze badges