CODEWITHSUNDEEP
javascriptasynchronouspromise
shinzou
shinzou

Reputation: 6192

Reuse promise with arguments

I want to use a promise with arguments, like the following psudo code:

let lookForXPromise = new Promise(arg1. arg2, function(resolve, reject){
    asyncFunc(arg1, arg2, function(value){
      if(value != "undefined"){
        resolve(value);
      }
      else{
        reject(); // didn't find X
      }
     });
   });

lookForXPromise(1, "foo").then(
  function(val){ ... do something...
}).catch(){ ...

But it appears that a promise only receives function(resolve, reject), so how can I declare a promise and reuse it with different arguments?

EDIT: this is so it will be possible to iterate over a collection of values and each time send different value to the promise.

Upvotes: 0

Views: 563

Answers (1)

Freyja
Freyja

Reputation: 40804

A promise is not a function; it is the "promised future return value" of a function. Therefore, you'd just write a function that takes those arguments and creates a new promise:

function lookForXPromise(arg1, arg2) {
  return new Promise(function(resolve, reject){
    asyncFunc(arg1, arg2, function(value){
      if(value != "undefined"){
        resolve(value);
      }
      else{
        reject(); // didn't find X
      }
    });
  });
}

// now you can call lookForXPromise as a function:
lookForXPromise(1, "foo")
  .then(() => { /* ... */ })
  .catch(() => { /* ... */ });

Upvotes: 2

Related Questions