[SOLVED] Wait for multiple promises to finish

Wait for multiple promises to finish

I am using the SQLStorage from the Ionic platform. The remove function returns a promise. In my code I need to remove multiple values. When these are all finished I need to execute some code.

How can I wait for all of these and then execute a callback function?

Code:

removeAll() {    
  this.storage.remove(key1);
  this.storage.remove(key2);
  this.storage.remove(key3);    
}

Nesting all is a bad practise so I am looking for a decent solution :)

removeAll() {
  return this.storage.remove(key1).then(() => {
    this.storage.remove(key2).then(() => {
      this.storage.remove(key3);        
    });
  });
};

Solution

You can use

removeAll() {
  Promise.all([
    this.storage.remove(key1),
    this.storage.remove(key2),
    this.storage.remove(key3),
  ]).then(value => doSomething());

value is an array that contains the return values of each async call passed to Promise.all([...]) matching in order.