Why does this node.js Buffer contain random values?

Question

I would like to create a node.js Buffer that contains 'x'throughout.

function createBuffer(buffer_size)
{
    var buf = new Buffer(buffer_size);
    var i;
    for (i=0;i<buffer_size;i++)
    {
        buf.write('x');
    }

    return buf;
}

var testbuf = createBuffer(5);
console.log(testbuf);

The console result is;

<Buffer 78 d3 f6 21 7c>

Why does Buffer contain random values when 'x' is written to the Buffer?

Answer 1

You are writing to default offset ie 0 again and again. you should use

buff.write('x',i); //this will increment the offset

What you are getting is some garbage value on other offsets.