Created
June 11, 2013 16:24
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Promises doodle
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function retProm() { | |
var def = when.defer(); | |
return def.resolve(); | |
} | |
console.log('one'); | |
retProm().then(function(){console.log('two')); | |
console.log('three'); | |
// this will print: | |
// | |
// one | |
// three | |
// two |
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Let me explain further the difference between our two examples. In yours, when you call
def.resolve
,then
has not yet returned. So the implementation must insert an extra tick before callingonFulfilled
, to ensure thatthen
returns first.In my example, when I call
def.resolve
,then
has already returned, since an async operation has already happened. So the implementation does not have to insert an extra tick before callingonFulfilled
, sincethen
has already returned.