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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | 1x 1x 1x 1x 10x 10x 10x 10x 10x 10x 10x 21x 21x 21x 10x 10x 10x | import { floor } from './floor.ts';
import { empty } from './unicode.ts';
// eslint-disable-next-line no-secrets/no-secrets
const ALPHABET = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
/**
* Options for the {@link numberToLetter} function
* @group String
* @category Operations
*/
export type NumberToLetterOptions = {
/** The alphabet to use */
alphabet?: string;
};
/**
* Convert a number to a letter, using the alphabet (default: A-Z)
* @param num - The number to convert
* @param options - see {@link NumberToLetterOptions}
* @returns The letter
* @group String
* @category Operations
*/
export function numberToLetter(
num: number,
{ alphabet = ALPHABET }: NumberToLetterOptions = {},
): string {
let n = num;
const base = alphabet.length;
const letters: string[] = [];
do {
--n;
letters.unshift(alphabet[n % base]);
n = floor(n / base, { tolerance: 0.005 });
} while (n > 0);
return letters.join(empty);
}
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