Helper to chain method calls while we're waiting for |> (the js pipe operator)

chain.js

const chain = (obj, op = obj => obj, ...restOps) => restOps.length > 0
    ? chain(op(obj), ...restOps)
    : op(obj);

Example usage

Given these methods to process an array

const mapper = collection => collection.map(x => /*something*/);
const filter = collection => collection.filter(x => /*something*/);

With the pipe operator I would do like this:

// JS with the pipe operator (currently a stage 2 proposal)
console.log( arr |> mapper |> filter |> (coll => coll.length));

Since we don't have the pipe operator yet, I'll settle for this:

console.log(chain(arr, mapper, filter, coll => coll.length));