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stringify.js
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Created: Mon, Feb 10, 23:05

stringify.js
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	import validate from './validate.js';
	/**
	* Convert array of 16 byte values to UUID string format of the form:
	* XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
	*/

	const byteToHex = [];

	for (let i = 0; i < 256; ++i) {
	byteToHex.push((i + 0x100).toString(16).substr(1));
	}

	function stringify(arr, offset = 0) {
	// Note: Be careful editing this code! It's been tuned for performance
	// and works in ways you may not expect. See https://github.com/uuidjs/uuid/pull/434
	const uuid = (byteToHex[arr[offset + 0]] + byteToHex[arr[offset + 1]] + byteToHex[arr[offset + 2]] + byteToHex[arr[offset + 3]] + '-' + byteToHex[arr[offset + 4]] + byteToHex[arr[offset + 5]] + '-' + byteToHex[arr[offset + 6]] + byteToHex[arr[offset + 7]] + '-' + byteToHex[arr[offset + 8]] + byteToHex[arr[offset + 9]] + '-' + byteToHex[arr[offset + 10]] + byteToHex[arr[offset + 11]] + byteToHex[arr[offset + 12]] + byteToHex[arr[offset + 13]] + byteToHex[arr[offset + 14]] + byteToHex[arr[offset + 15]]).toLowerCase(); // Consistency check for valid UUID. If this throws, it's likely due to one
	// of the following:
	// - One or more input array values don't map to a hex octet (leading to
	// "undefined" in the uuid)
	// - Invalid input values for the RFC `version` or `variant` fields

	if (!validate(uuid)) {
	throw TypeError('Stringified UUID is invalid');
	}

	return uuid;
	}

	export default stringify;

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