Barcode Generator

function barcodeGenerator(input) {
    let startNum = Number(input[0]);
    let finalNum = Number(input[1]);
    let output = '';
    for (let a = Math.floor(startNum / 1000); a <= Math.floor(finalNum / 1000); a++) {
        for (let b = Math.floor(startNum / 100) % 10; b <= Math.floor(finalNum / 100) % 10; b++) {
            for (let c = Math.floor(startNum / 10) % 10; c <= Math.floor(finalNum / 10) % 10; c++) {
                for (let d = startNum % 10; d <= finalNum % 10; d++) {
                    if (a % 2 === 1 && b % 2 === 1 && c % 2 === 1 && d % 2 === 1) {
                        output += `${a}${b}${c}${d} `;
                    }
                }
            }
        }
    }
    console.log(output);
}

ИЛИ:

function barcodeGenerator(input) {
    let startNum = input[0];
    let finalNum = input[1];
    let output = '';
    for (let a = startNum[0]; a <= finalNum[0]; a++) {
        for (let b = startNum[1]; b <= finalNum[1]; b++) {
            for (let c = startNum[2]; c <= finalNum[2]; c++) {
                for (let d = startNum[3]; d <= finalNum[3]; d++) {
                    if (a % 2 === 1 && b % 2 === 1 && c % 2 === 1 && d % 2 === 1) {
                        output += `${a}${b}${c}${d} `;
                    }
                }
            }
        }
    }
    console.log(output);
}