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The cornerstone of JavaScript is the function. It is a flexible abstraction that works as the basis for other abstractions, such as Promises, Iterables, Observables, and others. I have been teaching these concepts in conferences and workshops, and over time I have found an elegant summary of these abstractions, layed out in a pyramid. In this blog post I’ll provide a tour through these layers in the pyramid. FUNCTIONS X => Y Function Value The very base of JavaScript are the first-class v...