test-substring v index

test-substring-v-index.js

var alphabet = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
var alphabetLength = alphabet.length;

var i, rnd, trips = 1000000000;

var d1 = new Date();
console.log(d1);
for (i = 0; i < trips; i++) {
    rnd = Math.floor(Math.random() * alphabetLength);
	alphabet.substring(rnd, rnd + 1);
}
var d2 = new Date();
console.log(d2);

var d3 = new Date();
console.log(d3);
for (i = 0; i < trips; i++) {
    rnd = Math.floor(Math.random() * alphabetLength);
	alphabet[rnd];
}
var d4 = new Date();
console.log(d4);