webpack-refactoring-vs-old-code

var Benchmark = require('benchmark');
var expect = require('expect');
var suite = new Benchmark.Suite;

var test = {
    reasons: [],
    chunks: []
};

for (var s = 0; s < 5000; s++) {
    test.reasons.push({
        module: { chunks: [4,21,3,214,12,5,12,5]}
    });
    test.chunks.push({
        entryModule: [1,2,3,4,5,6,7]
    });
}

suite
    .add('Refactoring code', () => refactoringCode(test))
    .add('Old code', () => oldCode(test))
    .on('cycle', event => console.log(String(event.target)))
    .on('complete', function() {console.log('Fastest is ' + this.filter('fastest').map('name'))})
    .run({ 'async': true });


function refactoringCode(m) {
    var result = 0;
    var reasons = m.reasons;
    for(var index = 0; index < reasons.length; index++) {
        var reasonModule = reasons[index].module;
        if(!reasonModule) continue;
        result = result + reasonModule.chunks.length;
    }

    var chunks = m.chunks;
    for(var i = 0; i < chunks.length; i++) {
        if(chunks[i].entryModule === m) {
            result++;
        }
    }

    return result + m.chunks.length;
}

function oldCode(m) {
	const result = m.reasons.map((r) => {
        if(!r.module) return 0;
        return r.module.chunks.length;
    }).reduce((a, b) => {
        return a + b;
    }, 0) + m.chunks.length + m.chunks.filter((c) => {
        return c.entryModule === m;
    }).length;
    return result;
}