getify

Comparing: array method chaining, generator delegations, and transducing

I'm writing this quick post to respond to a recent twitter conversation where claims were made about the merits (or lack thereof) of transducers, as they relate to composing list comprehensions (map, filter).

For comparison sake throughout the rest of my post, below you'll find three (actually four!) implementations of a simple list operation demo:

• Array Method Chaining (jump to analysis)
  • Alternate: Array Method Composition (jump to analysis)
• Generator/Iterator Delegations (jump to analysis)
• Transducing (jump to analysis)

ahmedbaig

// Dynamic Flags
let args = {};process.argv.forEach(function (val, index, array) {let valsplit = val.split("=");args[valsplit[0]] = valsplit[1]});
// Speedometer
function formatBytes(a,b=2,k=1024){with(Math){let d=floor(log(a)/log(k));return 0==a?"0 Bytes":parseFloat((a/pow(k,d)).toFixed(max(0,b)))+" "+["Bytes","KB","MB","GB","TB","PB","EB","ZB","YB"][d]}}

var fs = require('fs');
var AWS = require('aws-sdk');
const StreamSpeed = require('streamspeed');

// File