What happens when `somevar` is `undefined` and resolved after `$q.all([somevar]).then(function(data)){};` is executed?

$q.all([promise]).then(function(data)){
 console.log('resolved');
}; 

What happens when the promise is 'undefined' and gets resolved? Even if the promise is null or undefined, it still resolves. This behavior of $q is confusing me. Can you please clarify this for me?

Answer №1

$q.all has the ability to accept plain values in addition to promises, even though this is not documented. It will automatically convert them if needed. Therefore, your code can be rewritten as:

$q.all([$q.when(promise)]).then(function(data)) {
  console.log('resolved');
};

If promise is null, the promise that is returned will resolve with null. This explains why you are seeing [null] in the data.

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