Array indexOf performance

array-indexof.js

function findString(length=1) {

    // const num1 =  String(Math.floor(Math.random() * Math.pow(10, length)));

    const string1 = new Array(length).fill(Math.floor(Math.random() * 10)).join("");
    const string2 = new Array(length).fill("a").join("");
    const string3 = new Array(length).fill("a").join("");
    console.log(string1 , string2, string3)
    
    // create 100000 strings, with only the last string being the matching one
    const strings = new Array(999999).fill(string1);
    strings.push(string2);

    // start and measure the process
    const start = performance.now();
    // console.time();
    const i = strings.indexOf(string3);
    // console.timeEnd();
    const end = performance.now();
    console.log(i, end-start);
}