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<html><head> <script src="http://static.jsbin.com/js/vendor/traceur.js"></script> <meta charset="utf-8"> <title>Traceur ES6 Promise Object</title></head><body> <script> var squareOfPositiveNumber = function(number) { var myPromise = new Promise(function(resolve, reject) { if (number > 0) { resolve(number * number); } else { reject(new Error("Error:It is not a positive number.")); } }); return myPromise; }; var squarePromise1 = squareOfPositiveNumber(5); squarePromise1.then(function(result) { console.log(result); }); var squarePromise2 = squareOfPositiveNumber(-4); squarePromise2.then(null, function(error) { console.log(error.toString()); }); </script></body></html>
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