An implementation of Promise then with ES3 syntax
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Promise library targeting ES3

"Promises/A+ logo"


This is simply an implementation of the then function, just for learning.
It is written with ES3 syntax.
setTimeout is used to ensure asynchronous flow.

Contrary to many other implementations, here a promise object only exposes status, value and resolve properties. No internal properties are exposed. Instead, an enhanced promise object is created for every promise and a register links the promise to its enhanced promise.
At the moment the register is a simple array and this data structure should be replaced in a future better performing version.

Promises/A+ compliance tests

npm run test


Command used to generate minified file

.node_modules/uglify-js/bin/uglifyjs src/promise.js --support-ie8 --compress --output src/promise.min.js