let buf = Buffer.alloc(15, 'a');
console.log(buf);
<Buffer 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61>
let buf = Buffer.alloc(15, 'a');
console.log(buf);
<Buffer 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61>