unicodeToWin1251 function

unicodeToWin1251.js

const map = {
	0: 0,
	1: 1,
	2: 2,
	3: 3,
	4: 4,
	5: 5,
	6: 6,
	7: 7,
	8: 8,
	9: 9,
	10: 10,
	11: 11,
	12: 12,
	13: 13,
	14: 14,
	15: 15,
	16: 16,
	17: 17,
	18: 18,
	19: 19,
	20: 20,
	21: 21,
	22: 22,
	23: 23,
	24: 24,
	25: 25,
	26: 26,
	27: 27,
	28: 28,
	29: 29,
	30: 30,
	31: 31,
	32: 32,
	33: 33,
	34: 34,
	35: 35,
	36: 36,
	37: 37,
	38: 38,
	39: 39,
	40: 40,
	41: 41,
	42: 42,
	43: 43,
	44: 44,
	45: 45,
	46: 46,
	47: 47,
	48: 48,
	49: 49,
	50: 50,
	51: 51,
	52: 52,
	53: 53,
	54: 54,
	55: 55,
	56: 56,
	57: 57,
	58: 58,
	59: 59,
	60: 60,
	61: 61,
	62: 62,
	63: 63,
	64: 64,
	65: 65,
	66: 66,
	67: 67,
	68: 68,
	69: 69,
	70: 70,
	71: 71,
	72: 72,
	73: 73,
	74: 74,
	75: 75,
	76: 76,
	77: 77,
	78: 78,
	79: 79,
	80: 80,
	81: 81,
	82: 82,
	83: 83,
	84: 84,
	85: 85,
	86: 86,
	87: 87,
	88: 88,
	89: 89,
	90: 90,
	91: 91,
	92: 92,
	93: 93,
	94: 94,
	95: 95,
	96: 96,
	97: 97,
	98: 98,
	99: 99,
	100: 100,
	101: 101,
	102: 102,
	103: 103,
	104: 104,
	105: 105,
	106: 106,
	107: 107,
	108: 108,
	109: 109,
	110: 110,
	111: 111,
	112: 112,
	113: 113,
	114: 114,
	115: 115,
	116: 116,
	117: 117,
	118: 118,
	119: 119,
	120: 120,
	121: 121,
	122: 122,
	123: 123,
	124: 124,
	125: 125,
	126: 126,
	127: 127,
	1027: 129,
	8225: 135,
	1046: 198,
	8222: 132,
	1047: 199,
	1168: 165,
	1048: 200,
	1113: 154,
	1049: 201,
	1045: 197,
	1050: 202,
	1028: 170,
	160: 160,
	1040: 192,
	1051: 203,
	164: 164,
	166: 166,
	167: 167,
	169: 169,
	171: 171,
	172: 172,
	173: 173,
	174: 174,
	1053: 205,
	176: 176,
	177: 177,
	1114: 156,
	181: 181,
	182: 182,
	183: 183,
	8221: 148,
	187: 187,
	1029: 189,
	1056: 208,
	1057: 209,
	1058: 210,
	8364: 136,
	1112: 188,
	1115: 158,
	1059: 211,
	1060: 212,
	1030: 178,
	1061: 213,
	1062: 214,
	1063: 215,
	1116: 157,
	1064: 216,
	1065: 217,
	1031: 175,
	1066: 218,
	1067: 219,
	1068: 220,
	1069: 221,
	1070: 222,
	1032: 163,
	8226: 149,
	1071: 223,
	1072: 224,
	8482: 153,
	1073: 225,
	8240: 137,
	1118: 162,
	1074: 226,
	1110: 179,
	8230: 133,
	1075: 227,
	1033: 138,
	1076: 228,
	1077: 229,
	8211: 150,
	1078: 230,
	1119: 159,
	1079: 231,
	1042: 194,
	1080: 232,
	1034: 140,
	1025: 168,
	1081: 233,
	1082: 234,
	8212: 151,
	1083: 235,
	1169: 180,
	1084: 236,
	1052: 204,
	1085: 237,
	1035: 142,
	1086: 238,
	1087: 239,
	1088: 240,
	1089: 241,
	1090: 242,
	1036: 141,
	1041: 193,
	1091: 243,
	1092: 244,
	8224: 134,
	1093: 245,
	8470: 185,
	1094: 246,
	1054: 206,
	1095: 247,
	1096: 248,
	8249: 139,
	1097: 249,
	1098: 250,
	1044: 196,
	1099: 251,
	1111: 191,
	1055: 207,
	1100: 252,
	1038: 161,
	8220: 147,
	1101: 253,
	8250: 155,
	1102: 254,
	8216: 145,
	1103: 255,
	1043: 195,
	1105: 184,
	1039: 143,
	1026: 128,
	1106: 144,
	8218: 130,
	1107: 131,
	8217: 146,
	1108: 186,
	1109: 190,
};

const unicodeToWin1251 = (string) => {
    const mappedChars = [];

	for (let i = 0; i < string.length; i++) {
		const code = string.charCodeAt(i);

		if (!(code in map)) {
			throw `Character ${string.charAt(i)} isn't supported by win1251!`;
		}

		mappedChars.push(String.fromCharCode(map[code]));
	}

	return mappedChars.join('');
};