node.js - Why am I getting this error? r1= buf1.compare(buf2); ^ TypeError: Object Rahul has no method 'compare' -

/*this demo program campare buffers each other. expected output should numbers came know these equal or not. taking 3 buffer variables , storing data it. */  var buf1 = new buffer('rahul');  buffer contains rahul var buf2 = new buffer('kumar');  buffer contains kumar var buf3 = new buffer('rahul');  buffer contains rahul  //now comparing these buffers each other  r1= buf1.compare(buf2);  r2= buf1.compare(buf3);  r3= buf2.compare(buf3);    //printing them console  console.log(r1+ " " + r2 + " " + r3); 

'compare' not prototype function. should used as:

buffer.compare(b1,b2) 

added code example:

var b1=new buffer("a"); var b2=new buffer("b"); var r=buffer.compare(b1,b2); console.log(r);