randomstringsgenerator/index.js at master · 0x4bd0/randomstringsgenerator · GitHub

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let generateArrayOfCharsFromAscii = (from, to) => {
	const n = [];
	for (let i = from; i <= to; i++) {
		n.push(i);
	}
	return n;
};

const rsg = (
	length = 10,
	params = ['lowerCase','numbers']
) => {
	let genFrom = [];
	if ((params.includes('upperCase')))
		genFrom = genFrom.concat(generateArrayOfCharsFromAscii(65, 90));
	if ((params.includes('lowerCase')))
		genFrom = genFrom.concat(generateArrayOfCharsFromAscii(97, 122));
	if  ((params.includes('numbers'))) genFrom = genFrom.concat(generateArrayOfCharsFromAscii(48, 57));
	if  ((params.includes('specialChars')))
		genFrom = genFrom
			.concat(generateArrayOfCharsFromAscii(33, 47))
			.concat(generateArrayOfCharsFromAscii(58, 64))
			.concat(generateArrayOfCharsFromAscii(91, 96))
			.concat(generateArrayOfCharsFromAscii(123, 126));

	const random = [];
	for (let i = 0; i < length; i++) {
		const luckyChar = genFrom[Math.floor(Math.random() * genFrom.length)];
		random.push(String.fromCharCode(luckyChar));
	}

	return random.join("");
};

module.exports = rsg;