always function for promise

var done = function(response) { console.log('response', response) }
var fail = function(error) { console.log('error', error) }
var always = function() { console.log('always') }
Promise.resolve(42).then(done).catch(fail).then(always, always)

var done = function(response) { console.log('response', response) }

var fail = function(error) { console.log('error', error) }

var always = function() { console.log('always') }

Promise.resolve(42).then(done).catch(fail).then(always, always)

from:https://github.com/github/fetch/issues/223#issuecomment-148927226

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