Why is the final value undefined for the for loop?

I am new to JavaScript and as I was practising I was not able to figure out why does the last value in my oddPairs array returns undefined when the loop ends?

const people = 56;
let numberGenerator = 0
let tickets = [];
let evenPais = [];
let oddPairs = [];

for (let counter = 1; counter <= people; counter++){
    let numberGenerator = Math.ceil(Math.random() *56);

for (let i = 1; i <= people; i++){
    if (tickets[i] % 2 === 0){
    }else {

console.log(evenPais.length + oddPairs.length);

Read more here: https://stackoverflow.com/questions/66272275/why-is-the-final-value-undefined-for-the-for-loop

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