nodeJS design pattern to break out of a async.waterfall or promise.then.then

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How to properly break out of a promise chain? 3 answers

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通过承诺，您可以将“后续承诺”附加到您需要的执行分支：

a("some data")
.then(function(data) {
    if(data) { 
        return "foo";//other promises won't be executed here
    } else {
       return b("some data").then(c).then(d)
    }
})
.catch(function(err) {
    //log error
})
.finally(function() {
     // do something
})

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