Node. js buffer. buffer. byteLength method

Method description:

Gets the length of the string in bytes.

This function differs from string.prototype.length in that it returns the number of characters in the String.

Grammar:

Buffer.byteLength(string, [encoding])

Receiving parameters:

String                                                          Characters and
Encoding                                              String encoding, default 'utf8'

Example:

str = 'u00bd + u00bc = u00be';

console.log(str + ": " + str.length + " characters, " +

  Buffer.byteLength(str, 'utf8') + " bytes");

// ½ + ¼ = ¾: 9 characters, 12 bytes

Source:

Buffer.byteLength = function(str, enc) {

  var ret;

  str = str + '';

  switch (enc) {

    case 'ascii':

    case 'binary':

    case 'raw':

      ret = str.length;

      break;

    case 'ucs2':

    case 'ucs-2':

    case 'utf16le':

    case 'utf-16le':

      ret = str.length * 2;

      break;

    case 'hex':

      ret = str.length >>> 1;

      break;

    default:

      ret = internal.byteLength(str, enc);

  }

  return ret;

};