dump_str.js

function dump_str(str) {
    for (let i = 0; i < str.length; ++i) {
        if (i % 16 === 0) {
            console.log('');
            process.stdout.write(('00000' + i.toString(16)).slice(-6) + ' |');
        }
        const _ = ('0' + str.charCodeAt(i).toString(16)).slice(-2);
        process.stdout.write(' ' + _); 
    }   
    console.log('');
}