Bench const array vs dynamic array

bench-array.js

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

function uid() {
	return 'xxx'.replace(/x/g, function(c) {
		return Math.floor(Math.random()*10);
	});
}

const count = 100;
var numbers = new Array(count);

for (var i = 0; i < count; i++) {
	numbers[i] = uid();
}

suite
	.add('const', function() {
		var a;
		if (Math.random() > 0.5) {
			a = [Number(numbers[Math.floor(Math.random()*numbers.length)]), Number(numbers[Math.floor(Math.random()*numbers.length)])];
		} else {
			a = [Number(numbers[Math.floor(Math.random()*numbers.length)])];
		}
	})
	.add('dynamic', function() {
		var a = [];
		if (Math.random() > 0.5) {
                a.push(Number(numbers[Math.floor(Math.random()*numbers.length)]), Number(numbers[Math.floor(Math.random()*numbers.length)]));
        } else {
                a.push(Number(numbers[Math.floor(Math.random()*numbers.length)]));
        }
	})
	.on('cycle', function(event) {
		console.log(String(event.target));
	})
	.on('complete', function() {
		console.log('Fastest is ' + this.filter('fastest').pluck('name'));
	})
	.run();