promises && js2015 felipe bernardes github.com/felipebernardes 

http://felipebernardes.github.io #votorantim http://tegra.me 2 

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execution stack && contexts 

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console.log(‘1’); setTimeout(() => console.log(‘2’), 0); console.log(‘3’); setTimeout(() => console.log(‘4’), 1000); //1324 

why promise? 

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● no more callback hell || pyramid of d00m ○ better performance ● cleaner && less code ○ better to undestand ○ easier to maintain ○ responsabilities && modularization ● better error handling 

why not promise? 

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how to promise 

doThis(param) .then( response => this.someAttr = param); 

( ... ) //syncronous code doThis(param) .then( response => this.someAttr = param); ( ... ) //syncronous code 

doThis(param) .then( response => this.someAttr = param) .catch ( errorResponse => console.log(errorResponse) ); 

all && race 

all http://jsfiddle.net/jsengel/mc3p01nb/ then after all promises returned, catch if any of them fails 

race then after one of the promises returns, catch if any of them fails 

var p3 = new Promise(function(resolve, reject) { setTimeout(resolve, 100, "three"); }); var p4 = new Promise(function(resolve, reject) { setTimeout(reject, 500, "four"); }); Promise.race([p3, p4]).then(function(value) { console.log(value); //three } 

example 

const setStatus = (group, status) => { const data = { status: status, shopId: group.shop.id, }; return $http.post(`${API}/group/${group.id}/shop/status`, data); }; // service 

ShopListService.setStatus(this.group, 'closed') .then( () => this.group.shop.status = 'closed'); // controller 

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further reading 

articles 

html5rocks http://www.html5rocks.com/en/tutorials/es6/promises nomadev http://nomadev.com.br/angularjs-promises-promessas-o-guia- definitivo/ david walsh https://davidwalsh.name/write-javascript-promises 

libs 

$q https://github.com/kriskowal/q bluebird http://bluebirdjs.com/ 

python sorocaba - https://groups.google.com/forum/m/#!forum/python-sorocaba guru sorocaba - https://www.facebook.com/GURUSorocaba/ hacklab - https://www.facebook.com/hacklabsorocaba/ GDG Sorocaba - https://www.facebook.com/GDGSorocaba/ SorocabaJS - https://www.facebook.com/sorocabajs/ JS Meetup - http://www.meetup.com/GDG-Sorocaba/ WomenTechmakers - https://www.facebook.com/groups/wtmsorocaba/ in.tegra.do - http://www.meetup.com/In-Tegra-Do/ english meetup - http://www.meetup.com/Sorocaba-English-Conversation-Happy-Hours/ #chegaMais 

we're hiring [email protected] [email protected] 

co-authored by felipe l. soares caique mitsuoka jean vitor 

speakerdeck.com/felipebernardes valeu!