hakunin/roman_numbers_in_javascript.html

## roman_numbers_in_javascript.html
<html>
<head>
<body >

<script>

var map = [
  [1000,'M'],
  [500,'D'],
  [100,'C'],
  [50,'L'],
  [10,'X'],
  [5,'V'],
  [1,'I']
];

// roman numbers in JS

var roman = function(n) {
  var r = '';
  var i = 0;
  var smaller;
  while (n > 0 && (i++ < 100)) {
    for (var m = 0; m < map.length; m++) {
      if (n >= map[m][0]) {
        n -= map[m][0];
        r += map[m][1];
        break;
      }
      if (map[m+1] && (map[m+1][0]+'')[0] == '1') {
        d = 1;
      } else if (map[m+2] && (map[m+2][0]+'')[0] == '1') {
        d = 2;
      }
      if (!!map[m+d] && (n >= (map[m][0]-map[m+d][0]))) {
        n -= map[m][0]-map[m+d][0];
        r += map[m+d][1]+map[m][1];
        break;
      }
    }
  }
  return r;
}

test_roman = function(n, correct_roman) {
  var r = roman(n);
  if (r == correct_roman) {
    console.log('PASS ', n , r, ' == ', correct_roman);
  } else {
    console.warn('FAIL ', n, r, ' != ', correct_roman);
  }
}
/**/
test_roman(1, 'I');
test_roman(2, 'II');
test_roman(3, 'III');
test_roman(4, 'IV');
test_roman(5, 'V');
test_roman(6, 'VI');
test_roman(7, 'VII');
test_roman(8, 'VIII');
test_roman(9, 'IX');
test_roman(10, 'X');
test_roman(11, 'XI');
test_roman(12, 'XII');
test_roman(13, 'XIII');
test_roman(14, 'XIV');
test_roman(15, 'XV');
test_roman(16, 'XVI');
test_roman(17, 'XVII');

test_roman(369, 'CCCLXIX');

test_roman(448, 'CDXLVIII');
test_roman(890, 'DCCCXC');

/**/
</script>
	<html>
	<head>
	<body >

	<script>

	var map = [
	[1000,'M'],
	[500,'D'],
	[100,'C'],
	[50,'L'],
	[10,'X'],
	[5,'V'],
	[1,'I']
	];

	// roman numbers in JS

	var roman = function(n) {
	var r = '';
	var i = 0;
	var smaller;
	while (n > 0 && (i++ < 100)) {
	for (var m = 0; m < map.length; m++) {
	if (n >= map[m][0]) {
	n -= map[m][0];
	r += map[m][1];
	break;
	}
	if (map[m+1] && (map[m+1][0]+'')[0] == '1') {
	d = 1;
	} else if (map[m+2] && (map[m+2][0]+'')[0] == '1') {
	d = 2;
	}
	if (!!map[m+d] && (n >= (map[m][0]-map[m+d][0]))) {
	n -= map[m][0]-map[m+d][0];
	r += map[m+d][1]+map[m][1];
	break;
	}
	}
	}
	return r;
	}

	test_roman = function(n, correct_roman) {
	var r = roman(n);
	if (r == correct_roman) {
	console.log('PASS ', n , r, ' == ', correct_roman);
	} else {
	console.warn('FAIL ', n, r, ' != ', correct_roman);
	}
	}
	/**/
	test_roman(1, 'I');
	test_roman(2, 'II');
	test_roman(3, 'III');
	test_roman(4, 'IV');
	test_roman(5, 'V');
	test_roman(6, 'VI');
	test_roman(7, 'VII');
	test_roman(8, 'VIII');
	test_roman(9, 'IX');
	test_roman(10, 'X');
	test_roman(11, 'XI');
	test_roman(12, 'XII');
	test_roman(13, 'XIII');
	test_roman(14, 'XIV');
	test_roman(15, 'XV');
	test_roman(16, 'XVI');
	test_roman(17, 'XVII');

	test_roman(369, 'CCCLXIX');

	test_roman(448, 'CDXLVIII');
	test_roman(890, 'DCCCXC');

	/**/
	</script>