buf.includes(value[, byteOffset][, encoding])
Operates similar to Array#includes(). The value can be a String, Buffer or Number. Strings are interpreted as UTF8 unless overridden with the encoding argument. Buffers will use the entire Buffer (to compare a partial Buffer use buf.slice()). Numbers can range from 0 to 255. 
The byteOffset indicates the index in buf where searching begins. 
const buf = Buffer.from('this is a buffer');
buf.includes('this');
  // returns true
buf.includes('is');
  // returns true
buf.includes(Buffer.from('a buffer'));
  // returns true
buf.includes(97); // ascii for 'a'
  // returns true
buf.includes(Buffer.from('a buffer example'));
  // returns false
buf.includes(Buffer.from('a buffer example').slice(0,8));
  // returns true
buf.includes('this', 4);
  // returns false
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