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• Returning promises allows us to build chains of asynchronous actions
• This makes a network request to the url and returns a promise. The promise resolves with a response object when the remote server responds with headers, but before the full response is downloaded. To read the full response, we should call the method response.text(): it returns a promise that resolves when the full text is downloaded from the remot...
• .then(function(result) { // (**) alert(result); // 1 return result * 2;
• .then(function(result) { // (***) alert(result); // 2 return result * 2;
• .then(function(result) { alert(result); // 4 return result * 2;

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