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Implementing JavaScript Promise in 70 lines of code! Implementing the Promise interface in pure JavaScript using pure JavaScript. And it’s much simpler than you may think, we can do so in only 70 lines. This will help with gaining a deeper insight into Promises by demystifying the underlying formation. Can also serve as a good interview question, if you are an evil employer (don’t be!). Let's dig into it! The infamous “then ”s.”s “would be changed to, but we also needto be! Let's change theanddefinitions:
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