If you want to get a feel for FRP, you could start with the old Fran tutorial from 1998, which has animated illustrations. For papers, start with Functional Reactive Animation and then follow up on links on the publications link on my home page and the FRP link on the Haskell wiki. Personally, I like … Read more
Numbers […Array(5).keys()]; => [0, 1, 2, 3, 4] Character iteration String.fromCharCode(…[…Array(‘D’.charCodeAt(0) – ‘A’.charCodeAt(0) + 1).keys()].map(i => i + ‘A’.charCodeAt(0))); => “ABCD” Iteration for (const x of Array(5).keys()) { console.log(x, String.fromCharCode(‘A’.charCodeAt(0) + x)); } => 0,”A” 1,”B” 2,”C” 3,”D” 4,”E” As functions function range(size, startAt = 0) { return […Array(size).keys()].map(i => i + startAt); } function … Read more
There is no native map to the Object object, but how about this: var myObject = { ‘a’: 1, ‘b’: 2, ‘c’: 3 }; Object.keys(myObject).forEach(function(key, index) { myObject[key] *= 2; }); console.log(myObject); // => { ‘a’: 2, ‘b’: 4, ‘c’: 6 } But you could easily iterate over an object using for … in: var … Read more
First: The term monad is a bit vacuous if you are not a mathematician. An alternative term is computation builder which is a bit more descriptive of what they are actually useful for. They are a pattern for chaining operations. It looks a bit like method chaining in object-oriented languages, but the mechanism is slightly … Read more
Consider a simple function that adds the first N natural numbers. (e.g. sum(5) = 0 + 1 + 2 + 3 + 4 + 5 = 15). Here is a simple JavaScript implementation that uses recursion: function recsum(x) { if (x === 0) { return 0; } else { return x + recsum(x – 1); … Read more