mk-pmb/0_dogcow.js

## 0_dogcow.js
/*jslint indent: 2, maxlen: 80, node: true */
/* -*- tab-width: 2 -*- */
'use strict';

var jsStringify = require('js-stringify'),
  animals = { dog: '\uD83D\uDC15', cow: '\uD83D\uDC04' };

function charCodes(s) {
  if (s.length === 1) { return '[' + s.charCodeAt(0).toString(16) + ']'; }
  return s.replace(/[~-\uFFFF]/g, charCodes);
}

animals.halfbreed = animals.dog[1] + animals.cow[0];
animals = JSON.stringify(animals, null, 2).replace(/\s+/g, ' ');

if ((typeof animals) !== 'string') { throw new Error('JSON fail'); }

console.log(['\uFEFF<!DOCTYPE html><html><head>',
  '<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">',
  '</head><body><p></p><script>',
  String(charCodes),
  'console.log(document.characterSet);',
  'console.log(charCodes(' + jsStringify(animals) + '));',
  'console.log(' + charCodes(jsStringify(animals)) + ');',
  '</script></body></html>'].join('\n'));

## 1_dogcow.html
<!DOCTYPE html><html><head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head><body><p></p><script>
function charCodes(s) {
  if (s.length === 1) { return '[' + s.charCodeAt(0).toString(16) + ']'; }
  return s.replace(/[~-\uFFFF]/g, charCodes);
}
console.log(document.characterSet);
console.log(charCodes("{ \"dog\": \"🐕\", \"cow\": \"🐄\", \"halfbreed\": \"��\" }"));
console.log("{ \"dog\": \"[d83d][dc15]\", \"cow\": \"[d83d][dc04]\", \"halfbreed\": \"[dc15][d83d]\" }");
</script></body></html>

## 2_ffox.console.log
UTF-8
{ "dog": "[d83d][dc15]", "cow": "[d83d][dc04]", "halfbreed": "[fffd][fffd]" }
{ "dog": "[d83d][dc15]", "cow": "[d83d][dc04]", "halfbreed": "[dc15][d83d]" }

## 3_dogcow_cli.js
/*jslint indent: 2, maxlen: 80, node: true */
'use strict';

var dog = '\uD83D\uDC15', cow = '\uD83D\uDC04', halves = dog[1] + cow[0],
  jsStringify = require('js-stringify');
console.log('orig:  <' + halves + '>');
console.log('JSON:  ' + JSON.stringify(halves));
console.log('js-str:' + jsStringify(halves));

## 4_dogcow_cli.hex.log
00000000  6f 72 69 67 3a 20 20 3c  ef bf bd ef bf bd 3e 0a  |orig:  <......>.|
00000010  4a 53 4f 4e 3a 20 20 22  ef bf bd ef bf bd 22 0a  |JSON:  "......".|
00000020  6a 73 2d 73 74 72 3a 22  ef bf bd ef bf bd 22 0a  |js-str:"......".|
00000030
	/jslint indent: 2, maxlen: 80, node: true /
	/* -- tab-width: 2 -- */
	'use strict';

	var jsStringify = require('js-stringify'),
	animals = { dog: '\uD83D\uDC15', cow: '\uD83D\uDC04' };

	function charCodes(s) {
	if (s.length === 1) { return '[' + s.charCodeAt(0).toString(16) + ']'; }
	return s.replace(/[~-\uFFFF]/g, charCodes);
	}

	animals.halfbreed = animals.dog[1] + animals.cow[0];
	animals = JSON.stringify(animals, null, 2).replace(/\s+/g, ' ');

	if ((typeof animals) !== 'string') { throw new Error('JSON fail'); }

	console.log(['\uFEFF<!DOCTYPE html><html><head>',
	'<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">',
	'</head><body><p></p><script>',
	String(charCodes),
	'console.log(document.characterSet);',
	'console.log(charCodes(' + jsStringify(animals) + '));',
	'console.log(' + charCodes(jsStringify(animals)) + ');',
	'</script></body></html>'].join('\n'));
	<!DOCTYPE html><html><head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	</head><body><p></p><script>
	function charCodes(s) {
	if (s.length === 1) { return '[' + s.charCodeAt(0).toString(16) + ']'; }
	return s.replace(/[~-\uFFFF]/g, charCodes);
	}
	console.log(document.characterSet);
	console.log(charCodes("{ \"dog\": \"🐕\", \"cow\": \"🐄\", \"halfbreed\": \"��\" }"));
	console.log("{ \"dog\": \"[d83d][dc15]\", \"cow\": \"[d83d][dc04]\", \"halfbreed\": \"[dc15][d83d]\" }");
	</script></body></html>
	UTF-8
	{ "dog": "[d83d][dc15]", "cow": "[d83d][dc04]", "halfbreed": "[fffd][fffd]" }
	{ "dog": "[d83d][dc15]", "cow": "[d83d][dc04]", "halfbreed": "[dc15][d83d]" }
	/jslint indent: 2, maxlen: 80, node: true /
	'use strict';

	var dog = '\uD83D\uDC15', cow = '\uD83D\uDC04', halves = dog[1] + cow[0],
	jsStringify = require('js-stringify');
	console.log('orig: <' + halves + '>');
	console.log('JSON: ' + JSON.stringify(halves));
	console.log('js-str:' + jsStringify(halves));
	00000000 6f 72 69 67 3a 20 20 3c ef bf bd ef bf bd 3e 0a \|orig: <......>.\|
	00000010 4a 53 4f 4e 3a 20 20 22 ef bf bd ef bf bd 22 0a \|JSON: "......".\|
	00000020 6a 73 2d 73 74 72 3a 22 ef bf bd ef bf bd 22 0a \|js-str:"......".\|
	00000030