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Introduction to JavaScript Promises Modern JS 勉強会 at GREE
The document discusses the complexities of asynchronous programming in JavaScript, highlighting issues like 'callback hell' and the importance of promises for managing asynchronous operations. It outlines the characteristics and benefits of promises, including their immutability once resolved and flow control capabilities. The text also touches on advancements in JavaScript such as ES6 generators
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brilliant and want laws changed so I can marry them." Traditional control flow: from requests import get location = get('http://www.telize.com/geoip').json() lat = location['latitude'] lon = location['longitude'] weather = get('http://api.openweathermap.org/data/2.1/find/city?lat=' + str(lat) + '&lon=' + str(lon) + '&cnt=1').json() print weather['list'][0]['weather'][0]['description']
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Presented at the STL Ember.js Meetup on 2014-02-06. Video: http://youtu.be/wc72cyYt8-c
node --harmony-generators script.jsSlides: pag.forbesl.co.uk Sequence 1function count(n){ var res = [] for (var x = 0; x < n; x++) { res.push(x) } return res } for (var x of count(5)) { console.log(x) } Sequence 2function count(){ var res = [] for (var x = 0; true; x++) { res.push(x) } return res } for (var x of count()) { console.log(x) } Sequence 3function* count(){ for (var x = 0; true; x++) {
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