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Correct way to populate an array from a promise


Correct way to populate an array from a promise

By : Zwulf
Date : December 01 2020, 04:52 PM
I wish did fix the issue. Using arrow functions would fix that.
Plus you don't really need to instantiate a new Person Object, every single time. In Angular, we generally use interfaces for static type checking. So unless you have a very strong reason to use classes instead, just use interfaces.
code :
export class PeopleTableComponent implements OnInit {
  people: Array < Person > = [];

  constructor(public helperService: HelperService) {}

  ngOnInit(): void {
    this.helperService.getPeople().then(res => this.people = res.people);
  }
}

interface Person {
  name: string;
}


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Correct way to populate an Array with a Range in Ruby

Correct way to populate an Array with a Range in Ruby


By : Bqm
Date : March 29 2020, 07:55 AM
like below fixes the issue I am working through a book which gives examples of Ranges being converted to equivalent arrays using their "to_a" methods , You can create an array with a range using splat,
code :
>> a=*(1..10)
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Array (1..10)
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
(1..10).to_a
=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
How to use promise in forEach loop of array to populate an object

How to use promise in forEach loop of array to populate an object


By : mtbdad
Date : March 29 2020, 07:55 AM
like below fixes the issue I am running a forEach loop on an array and making two calls which return promises, and I want to populate an object say this.options, and then do other stuff with it. Right now I am running into the async issue if i use the following code sample and i get into the then function first. , Promise.all() will be helpful here:
code :
var promises = [];

array.forEach(function(element) {
    promises.push(
        developer.getResources(element)
            .then((data) = > {
                name = data.items[0];
                return developer.getResourceContent(element, file);
            })
            .then((response) = > {
                fileContent = atob(response.content);
                self.files.push({
                    fileName: fileName,
                    fileType: fileType,
                    content: fileContent
                });
            }).catch ((error) = > {
                console.log('Error: ', error);
            })
    );
});

Promise.all(promises).then(() => 
    self.resultingFunction(self.files)
);
Promise inside promise: what's the correct way to return a variable from the child promise? (JS)

Promise inside promise: what's the correct way to return a variable from the child promise? (JS)


By : Brian shine
Date : March 29 2020, 07:55 AM
Does that help The definition of promises is that you cannot literally assign result to myresult. However, you can make myresult a promise that resolves directly to result for the caller, however many promises were used to get that. The basic idea is that inside of each function in your above block, you should be returning the next Promise in the chain. eg:
code :
function top() {

  //promise1
  return ParentPromise({
    ...some code here...
  }).then(function() {


    //promise2
        return ChildPromise({
          ..some code here...
        }).then(function(response) {
         var result = response.result.items;
         return result;

        });

});

};
correct way to alter an AxiosPromise to a regular Promise whilst avoiding the promise constructor anti pattern

correct way to alter an AxiosPromise to a regular Promise whilst avoiding the promise constructor anti pattern


By : Alpesh Rathod
Date : March 29 2020, 07:55 AM
I hope this helps . You can "wrap" the promise returned by axios.get in Promise.resolve, like so
the .then and .catch need to be rewritten too (I've simplified them a bit using new syntax for destructuring function arguments - probably used the wrong term there though)
code :
return Promise.resolve(axios.get<Material[]>("data.json"))
.then(({data}) => data)
.catch(({data}) => { throw data; });
Promise.all returning promise for array of promises, but returning correct value for single promise

Promise.all returning promise for array of promises, but returning correct value for single promise


By : user3082091
Date : December 27 2020, 02:42 PM
may help you . I am using Promise for Readfile from storage and convert to base64 string. I have array of images,using RNFS for read images ,
But if i execute all the promises at one it returning promise
code :
Promise.all([...promise_Images1, ...promise_Images2]).then(res => {
    // ...
})
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