@tldraw/editor/src/lib/utils/getIncrementedName.ts

tldraw infinite canvas SDK (editor).

/**
 * Get an incremented name (e.g. New page (2)) from a name (e.g. New page), based on an array of
 * existing names.
 *
 * @param name - The name to increment.
 * @param others - The array of existing names.
 * @public
 */
export function getIncrementedName(name: string, others: string[]) {
	let result = name
	const set = new Set(others)

	while (set.has(result)) {
		result = /^.*(\d+)$/.exec(result)?.[1]
			? result.replace(/(\d+)(?=\D?)$/, (m) => {
					return (+m + 1).toString()
				})
			: `${result} 1`
	}

	return result
}