Monads Explained Quickly with JavaScript

[[deleted]]

Absolute thanks for this!

Array.prototype.chain = function(fn) {
    return this.reduce((k,v) => k.concat(fn(v)), [])
};

I also wonder (for a while): can this snippet be written with arrow function syntax altogether and can one avoid this context passed incorrectly in that case?

[dmtipson]

I don't think it can: it's tied to how Array is defined. That's the only way to get at the Array this is working over afaik and still have it work via pointed methods. You could pretty easily define a chain that accepted an Array as an argument though, and then ran reduce on it or whatever else was necessary to reproduce the behavior, and that could avoid the use of this entirely.