Organize methods

Put common English methods to en/common.

packages/core/src/systems/en-UK/long-count/stringify.ts

@@ -6,158 +6,23 @@ import {
 } from '../../../common';
 import { numberToExponential } from '../../../exponent';
 import {
-	CENTILLIONS_PREFIXES,
-	CentillionsPrefix,
-	DECILLIONS_PREFIXES,
-	DecillionsPrefix,
 	DECIMAL_POINT,
-	EMPTY_GROUP_DIGITS,
-	EXPONENT_DELIMITER, GROUP_SEPARATOR,
 	GROUPING_SYMBOL,
-	HUNDRED,
+	EXPONENT_DELIMITER,
+	DECILLIONS_PREFIXES,
+	EMPTY_GROUP_DIGITS,
 	ILLION_SUFFIX,
 	MILLIA_PREFIX,
-	MILLIONS_PREFIXES,
-	MILLIONS_SPECIAL_PREFIXES,
-	MillionsPrefix,
-	MillionsSpecialPrefix,
-	NEGATIVE,
-	ONES,
-	OnesName,
-	SHORT_MILLIA_DELIMITER, SHORT_MILLIA_ILLION_DELIMITER, T_AFFIX,
-	TEN_PLUS_ONES,
-	TenPlusOnesName,
-	TENS,
-	TENS_ONES_SEPARATOR,
-	TensName,
+	SHORT_MILLIA_DELIMITER,
+	SHORT_MILLIA_ILLION_DELIMITER,
+	T_AFFIX,
 	THOUSAND,
+	makeHundredsName,
+	makeCentillionsPrefix,
+	repeatString,
+	StringifyGroupsOptions,
 } from '../../en/common';
 
-/**
- * Builds a name for numbers in tens and ones.
- * @param tens - Tens digit.
- * @param ones - Ones digit.
- * @param addTensDashes - Whether to add dashes between the tens and ones.
- * @returns string The name for the number.
- */
-const makeTensName = (tens: number, ones: number, addTensDashes: boolean) => {
-	if (tens === 0) {
-		return ONES[ones];
-	}
-
-	if (tens === 1) {
-		return TEN_PLUS_ONES[ones] as unknown as TenPlusOnesName;
-	}
-
-	if (ones === 0) {
-		return TENS[tens];
-	}
-
-	return `${TENS[tens] as Exclude<TensName, 'zero' | 'ten'>}${addTensDashes ? TENS_ONES_SEPARATOR : ' '}${ONES[ones] as Exclude<OnesName, 'zero'>}` as const;
-};
-
-/**
- * Builds a name for numbers in hundreds, tens, and ones.
- * @param hundreds - Hundreds digit.
- * @param tens - Tens digit.
- * @param ones - Ones digit.
- * @param addTensDashes - Whether to add dashes between the tens and ones.
- * @returns string The name for the number.
- */
-const makeHundredsName = (hundreds: number, tens: number, ones: number, addTensDashes: boolean) => {
-	if (hundreds === 0) {
-		return makeTensName(tens, ones, addTensDashes);
-	}
-
-	if (tens === 0 && ones === 0) {
-		return `${ONES[hundreds]} ${HUNDRED}` as const;
-	}
-
-	return `${ONES[hundreds]} ${HUNDRED} ${makeTensName(tens, ones, addTensDashes)}` as const;
-};
-
-/**
- * Builds a name for numbers in the millions.
- * @param millions - Millions digit.
- * @param currentMillia - Current millia- group.
- * @param longestMilliaCount - Number of millia- groups.
- * @returns string The millions prefix.
- */
-const makeMillionsPrefix = (
-	millions: number,
-	currentMillia: GroupPlace,
-	longestMilliaCount: GroupPlace,
-) => {
-	if (currentMillia === BigInt(0) && longestMilliaCount === BigInt(0)) {
-		return MILLIONS_SPECIAL_PREFIXES[millions] as MillionsSpecialPrefix;
-	}
-
-	return MILLIONS_PREFIXES[millions] as MillionsPrefix;
-};
-
-/**
- * Builds a name for numbers in the decillions.
- * @param decillions - Decillions digit.
- * @param millions - Millions digit.
- * @param currentMillia - Current millia- group.
- * @param longestMilliaCount - Number of millia- groups.
- * @returns string The decillions prefix.
- */
-const makeDecillionsPrefix = (
-	decillions: number,
-	millions: number,
-	currentMillia: GroupPlace,
-	longestMilliaCount: GroupPlace,
-) => {
-	if (decillions === 0) {
-		return makeMillionsPrefix(millions, currentMillia, longestMilliaCount);
-	}
-
-	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
-	const tensName = DECILLIONS_PREFIXES[decillions] as DecillionsPrefix;
-	return `${onesPrefix}${tensName}` as const;
-};
-
-/**
- * Builds a name for numbers in the centillions.
- * @param centillions - Centillions digit.
- * @param decillions - Decillions digit.
- * @param millions - Millions digit.
- * @param currentMillia - Current millia- group.
- * @param longestMilliaCount - Number of millia- groups.
- * @returns string The centillions prefix.
- */
-const makeCentillionsPrefix = (
-	centillions: number,
-	decillions: number,
-	millions: number,
-	currentMillia: GroupPlace,
-	longestMilliaCount: GroupPlace,
-) => {
-	if (centillions === 0) {
-		return makeDecillionsPrefix(decillions, millions, currentMillia, longestMilliaCount);
-	}
-
-	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
-	const tensName = DECILLIONS_PREFIXES[decillions] as DecillionsPrefix;
-	const hundredsName = CENTILLIONS_PREFIXES[centillions] as CentillionsPrefix;
-	return `${hundredsName}${onesPrefix}${decillions > 0 ? tensName : ''}` as const;
-};
-
-/**
- * Repeats a string a given number of times.
- * @param s - String to repeat.
- * @param count - Number of times to repeat the string.
- * @returns string The repeated string.
- */
-const repeatString = (s: string, count: GroupPlace) => {
-	let result = '';
-	for (let i = BigInt(0); i < count; i += BigInt(1)) {
-		result += s;
-	}
-	return result;
-};
-
 const getGroupName = (place: GroupPlace, shortenMillia: boolean) => {
 	if (place === BigInt(0)) {
 		return '' as const;
@@ -240,48 +105,6 @@ const getGroupName = (place: GroupPlace, shortenMillia: boolean) => {
 	return `${isThousand ? `${THOUSAND} ` : ''}${groupGroups}${ILLION_SUFFIX}` as const;
 };
 
-export interface StringifyGroupsOptions {
-	/**
-	 * Whether to add dashes between tens and ones (e.g. "sixty-nine").
-	 */
-	addTensDashes?: boolean;
-	/**
-	 * Use "millia^2-tillion" instead of "milliamilliatillion".
-	 */
-	shortenMillia?: boolean;
-}
-
-/**
- * Creates a group string.
- * @param groups - The groups.
- * @param options - Options to use when creating the group.
- * @returns string[] The groups represented into strings.
- */
-export const stringifyGroups = (groups: Group[], options?: StringifyGroupsOptions): string[] => {
-	const filteredGroups = groups.filter(([digits, place]) => (
-		place === BigInt(0) || digits !== EMPTY_GROUP_DIGITS
-	));
-
-	return filteredGroups.map(
-		([group, place]) => {
-			const makeHundredsArgs = group
-				.padStart(3, '0')
-				.split('')
-				.map((s) => Number(s)) as [number, number, number];
-
-			const groupDigitsName = makeHundredsName(
-				...makeHundredsArgs,
-				options?.addTensDashes ?? true,
-			);
-			const groupName = getGroupName(place, options?.shortenMillia ?? false);
-			if (groupName.length > 0) {
-				return `${groupDigitsName} ${groupName}`;
-			}
-			return groupDigitsName;
-		},
-	);
-};
-
 /**
  * Group a number string into groups of three digits, starting from the decimal point.
  * @param value - The number string to group.
@@ -319,27 +142,40 @@ export const splitIntoGroups = (value: string): Group[] => {
 	);
 };
 
-export interface MergeTokensOptions {
-	oneGroupPerLine?: boolean;
-}
-
 /**
- * Formats the final tokenized string.
- * @param tokens - The tokens to finalize.
- * @param options - The options to use.
+ * Creates a group string.
+ * @param groups - The groups.
+ * @param options - Options to use when creating the group.
+ * @returns string[] The groups represented into strings.
  */
-export const mergeTokens = (tokens: string[], options?: MergeTokensOptions) => (
-	tokens
-		.map((t) => t.trim())
-		.join(options?.oneGroupPerLine ? '\n' : GROUP_SEPARATOR)
-		.trim()
-);
+export const stringifyGroups = (groups: Group[], options?: StringifyGroupsOptions): string[] => {
+	const filteredGroups = groups.filter(([digits, place]) => (
+		place === BigInt(0) || digits !== EMPTY_GROUP_DIGITS
+	));
 
-/**
- * Makes a negative string.
- * @param s - The string to make negative.
- */
-export const makeNegative = (s: string) => {
-	const negativePrefix = `${NEGATIVE} `;
-	return s.startsWith(negativePrefix) ? s.slice(negativePrefix.length) : `${negativePrefix}${s}`;
+	return filteredGroups.map(
+		([group, place]) => {
+			const makeHundredsArgs = group
+				.padStart(3, '0')
+				.split('')
+				.map((s) => Number(s)) as [number, number, number];
+
+			const groupDigitsName = makeHundredsName(
+				...makeHundredsArgs,
+				options?.addTensDashes ?? true,
+			);
+			const groupName = getGroupName(place, options?.shortenMillia ?? false);
+			if (groupName.length > 0) {
+				return `${groupDigitsName} ${groupName}`;
+			}
+			return groupDigitsName;
+		},
+	);
 };
+
+export {
+	StringifyGroupsOptions,
+	MergeTokensOptions,
+	mergeTokens,
+	makeNegative,
+} from '../../en/common';

packages/core/src/systems/en-US/short-count/stringify.ts

@@ -6,158 +6,23 @@ import {
 } from '../../../common';
 import { numberToExponential } from '../../../exponent';
 import {
-	CENTILLIONS_PREFIXES,
-	CentillionsPrefix,
-	DECILLIONS_PREFIXES,
-	DecillionsPrefix,
 	DECIMAL_POINT,
-	EMPTY_GROUP_DIGITS,
-	EXPONENT_DELIMITER, GROUP_SEPARATOR,
 	GROUPING_SYMBOL,
-	HUNDRED,
+	EXPONENT_DELIMITER,
+	DECILLIONS_PREFIXES,
+	EMPTY_GROUP_DIGITS,
 	ILLION_SUFFIX,
 	MILLIA_PREFIX,
-	MILLIONS_PREFIXES,
-	MILLIONS_SPECIAL_PREFIXES,
-	MillionsPrefix,
-	MillionsSpecialPrefix,
-	NEGATIVE,
-	ONES,
-	OnesName,
-	SHORT_MILLIA_DELIMITER, SHORT_MILLIA_ILLION_DELIMITER, T_AFFIX,
-	TEN_PLUS_ONES,
-	TenPlusOnesName,
-	TENS,
-	TENS_ONES_SEPARATOR,
-	TensName,
+	SHORT_MILLIA_DELIMITER,
+	SHORT_MILLIA_ILLION_DELIMITER,
+	T_AFFIX,
 	THOUSAND,
+	makeHundredsName,
+	makeCentillionsPrefix,
+	repeatString,
+	StringifyGroupsOptions,
 } from '../../en/common';
 
-/**
- * Builds a name for numbers in tens and ones.
- * @param tens - Tens digit.
- * @param ones - Ones digit.
- * @param addTensDashes - Whether to add dashes between the tens and ones.
- * @returns string The name for the number.
- */
-const makeTensName = (tens: number, ones: number, addTensDashes: boolean) => {
-	if (tens === 0) {
-		return ONES[ones];
-	}
-
-	if (tens === 1) {
-		return TEN_PLUS_ONES[ones] as unknown as TenPlusOnesName;
-	}
-
-	if (ones === 0) {
-		return TENS[tens];
-	}
-
-	return `${TENS[tens] as Exclude<TensName, 'zero' | 'ten'>}${addTensDashes ? TENS_ONES_SEPARATOR : ' '}${ONES[ones] as Exclude<OnesName, 'zero'>}` as const;
-};
-
-/**
- * Builds a name for numbers in hundreds, tens, and ones.
- * @param hundreds - Hundreds digit.
- * @param tens - Tens digit.
- * @param ones - Ones digit.
- * @param addTensDashes - Whether to add dashes between the tens and ones.
- * @returns string The name for the number.
- */
-const makeHundredsName = (hundreds: number, tens: number, ones: number, addTensDashes: boolean) => {
-	if (hundreds === 0) {
-		return makeTensName(tens, ones, addTensDashes);
-	}
-
-	if (tens === 0 && ones === 0) {
-		return `${ONES[hundreds]} ${HUNDRED}` as const;
-	}
-
-	return `${ONES[hundreds]} ${HUNDRED} ${makeTensName(tens, ones, addTensDashes)}` as const;
-};
-
-/**
- * Builds a name for numbers in the millions.
- * @param millions - Millions digit.
- * @param currentMillia - Current millia- group.
- * @param longestMilliaCount - Number of millia- groups.
- * @returns string The millions prefix.
- */
-const makeMillionsPrefix = (
-	millions: number,
-	currentMillia: GroupPlace,
-	longestMilliaCount: GroupPlace,
-) => {
-	if (currentMillia === BigInt(0) && longestMilliaCount === BigInt(0)) {
-		return MILLIONS_SPECIAL_PREFIXES[millions] as MillionsSpecialPrefix;
-	}
-
-	return MILLIONS_PREFIXES[millions] as MillionsPrefix;
-};
-
-/**
- * Builds a name for numbers in the decillions.
- * @param decillions - Decillions digit.
- * @param millions - Millions digit.
- * @param currentMillia - Current millia- group.
- * @param longestMilliaCount - Number of millia- groups.
- * @returns string The decillions prefix.
- */
-const makeDecillionsPrefix = (
-	decillions: number,
-	millions: number,
-	currentMillia: GroupPlace,
-	longestMilliaCount: GroupPlace,
-) => {
-	if (decillions === 0) {
-		return makeMillionsPrefix(millions, currentMillia, longestMilliaCount);
-	}
-
-	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
-	const tensName = DECILLIONS_PREFIXES[decillions] as DecillionsPrefix;
-	return `${onesPrefix}${tensName}` as const;
-};
-
-/**
- * Builds a name for numbers in the centillions.
- * @param centillions - Centillions digit.
- * @param decillions - Decillions digit.
- * @param millions - Millions digit.
- * @param currentMillia - Current millia- group.
- * @param longestMilliaCount - Number of millia- groups.
- * @returns string The centillions prefix.
- */
-const makeCentillionsPrefix = (
-	centillions: number,
-	decillions: number,
-	millions: number,
-	currentMillia: GroupPlace,
-	longestMilliaCount: GroupPlace,
-) => {
-	if (centillions === 0) {
-		return makeDecillionsPrefix(decillions, millions, currentMillia, longestMilliaCount);
-	}
-
-	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
-	const tensName = DECILLIONS_PREFIXES[decillions] as DecillionsPrefix;
-	const hundredsName = CENTILLIONS_PREFIXES[centillions] as CentillionsPrefix;
-	return `${hundredsName}${onesPrefix}${decillions > 0 ? tensName : ''}` as const;
-};
-
-/**
- * Repeats a string a given number of times.
- * @param s - String to repeat.
- * @param count - Number of times to repeat the string.
- * @returns string The repeated string.
- */
-const repeatString = (s: string, count: GroupPlace) => {
-	let result = '';
-	for (let i = BigInt(0); i < count; i += BigInt(1)) {
-		result += s;
-	}
-	return result;
-};
-
 const getGroupName = (place: GroupPlace, shortenMillia: boolean) => {
 	if (place === BigInt(0)) {
 		return '' as const;
@@ -238,48 +103,6 @@ const getGroupName = (place: GroupPlace, shortenMillia: boolean) => {
 	return `${groupGroups}${ILLION_SUFFIX}` as const;
 };
 
-export interface StringifyGroupsOptions {
-	/**
-	 * Whether to add dashes between tens and ones (e.g. "sixty-nine").
-	 */
-	addTensDashes?: boolean;
-	/**
-	 * Use "millia^2-tillion" instead of "milliamilliatillion".
-	 */
-	shortenMillia?: boolean;
-}
-
-/**
- * Creates a group string.
- * @param groups - The groups.
- * @param options - Options to use when creating the group.
- * @returns string[] The groups represented into strings.
- */
-export const stringifyGroups = (groups: Group[], options?: StringifyGroupsOptions): string[] => {
-	const filteredGroups = groups.filter(([digits, place]) => (
-		place === BigInt(0) || digits !== EMPTY_GROUP_DIGITS
-	));
-
-	return filteredGroups.map(
-		([group, place]) => {
-			const makeHundredsArgs = group
-				.padStart(3, '0')
-				.split('')
-				.map((s) => Number(s)) as [number, number, number];
-
-			const groupDigitsName = makeHundredsName(
-				...makeHundredsArgs,
-				options?.addTensDashes ?? true,
-			);
-			const groupName = getGroupName(place, options?.shortenMillia ?? false);
-			if (groupName.length > 0) {
-				return `${groupDigitsName} ${groupName}`;
-			}
-			return groupDigitsName;
-		},
-	);
-};
-
 /**
  * Group a number string into groups of three digits, starting from the decimal point.
  * @param value - The number string to group.
@@ -306,7 +129,7 @@ export const splitIntoGroups = (value: string): Group[] => {
 			if (lastGroup[GROUP_PLACE_INDEX] === currentPlace) {
 				const lastGroupDigits = lastGroup[0].split('');
 				lastGroupDigits[currentPlaceInGroup] = c;
-				return [...acc.slice(0, -1), [
+				return [...acc.slice(0, -1) ?? [], [
 					lastGroupDigits.join('') as GroupDigits,
 					currentPlace,
 				]];
@@ -317,27 +140,40 @@ export const splitIntoGroups = (value: string): Group[] => {
 	);
 };
 
-export interface MergeTokensOptions {
-	oneGroupPerLine?: boolean;
-}
-
 /**
- * Formats the final tokenized string.
- * @param tokens - The tokens to finalize.
- * @param options - The options to use.
+ * Creates a group string.
+ * @param groups - The groups.
+ * @param options - Options to use when creating the group.
+ * @returns string[] The groups represented into strings.
  */
-export const mergeTokens = (tokens: string[], options?: MergeTokensOptions) => (
-	tokens
-		.map((t) => t.trim())
-		.join(options?.oneGroupPerLine ? '\n' : GROUP_SEPARATOR)
-		.trim()
-);
+export const stringifyGroups = (groups: Group[], options?: StringifyGroupsOptions): string[] => {
+	const filteredGroups = groups.filter(([digits, place]) => (
+		place === BigInt(0) || digits !== EMPTY_GROUP_DIGITS
+	));
 
-/**
- * Makes a negative string.
- * @param s - The string to make negative.
- */
-export const makeNegative = (s: string) => {
-	const negativePrefix = `${NEGATIVE} `;
-	return s.startsWith(negativePrefix) ? s.slice(negativePrefix.length) : `${negativePrefix}${s}`;
+	return filteredGroups.map(
+		([group, place]) => {
+			const makeHundredsArgs = group
+				.padStart(3, '0')
+				.split('')
+				.map((s) => Number(s)) as [number, number, number];
+
+			const groupDigitsName = makeHundredsName(
+				...makeHundredsArgs,
+				options?.addTensDashes ?? true,
+			);
+			const groupName = getGroupName(place, options?.shortenMillia ?? false);
+			if (groupName.length > 0) {
+				return `${groupDigitsName} ${groupName}`;
+			}
+			return groupDigitsName;
+		},
+	);
 };
+
+export {
+	StringifyGroupsOptions,
+	MergeTokensOptions,
+	mergeTokens,
+	makeNegative,
+} from '../../en/common';

packages/core/src/systems/en/common.ts

@@ -1,4 +1,4 @@
-import { Group } from '../../common';
+import { Group, GroupPlace } from '../../common';
 
 export const GROUP_SEPARATOR = ' ' as const;
 
@@ -175,3 +175,169 @@ export const MILLIA_PREFIX = 'millia' as const;
  * Suffix for -illion number names.
  */
 export const ILLION_SUFFIX = 'illion' as const;
+
+/**
+ * Builds a name for numbers in tens and ones.
+ * @param tens - Tens digit.
+ * @param ones - Ones digit.
+ * @param addTensDashes - Whether to add dashes between the tens and ones.
+ * @returns string The name for the number.
+ */
+const makeTensName = (tens: number, ones: number, addTensDashes: boolean) => {
+	if (tens === 0) {
+		return ONES[ones];
+	}
+
+	if (tens === 1) {
+		return TEN_PLUS_ONES[ones] as unknown as TenPlusOnesName;
+	}
+
+	if (ones === 0) {
+		return TENS[tens];
+	}
+
+	return `${TENS[tens] as Exclude<TensName, 'zero' | 'ten'>}${addTensDashes ? TENS_ONES_SEPARATOR : ' '}${ONES[ones] as Exclude<OnesName, 'zero'>}` as const;
+};
+
+/**
+ * Builds a name for numbers in hundreds, tens, and ones.
+ * @param hundreds - Hundreds digit.
+ * @param tens - Tens digit.
+ * @param ones - Ones digit.
+ * @param addTensDashes - Whether to add dashes between the tens and ones.
+ * @returns string The name for the number.
+ */
+export const makeHundredsName = (
+	hundreds: number,
+	tens: number,
+	ones: number,
+	addTensDashes: boolean,
+) => {
+	if (hundreds === 0) {
+		return makeTensName(tens, ones, addTensDashes);
+	}
+
+	if (tens === 0 && ones === 0) {
+		return `${ONES[hundreds]} ${HUNDRED}` as const;
+	}
+
+	return `${ONES[hundreds]} ${HUNDRED} ${makeTensName(tens, ones, addTensDashes)}` as const;
+};
+
+/**
+ * Builds a name for numbers in the millions.
+ * @param millions - Millions digit.
+ * @param currentMillia - Current millia- group.
+ * @param longestMilliaCount - Number of millia- groups.
+ * @returns string The millions prefix.
+ */
+const makeMillionsPrefix = (
+	millions: number,
+	currentMillia: GroupPlace,
+	longestMilliaCount: GroupPlace,
+) => {
+	if (currentMillia === BigInt(0) && longestMilliaCount === BigInt(0)) {
+		return MILLIONS_SPECIAL_PREFIXES[millions] as MillionsSpecialPrefix;
+	}
+
+	return MILLIONS_PREFIXES[millions] as MillionsPrefix;
+};
+
+/**
+ * Builds a name for numbers in the decillions.
+ * @param decillions - Decillions digit.
+ * @param millions - Millions digit.
+ * @param currentMillia - Current millia- group.
+ * @param longestMilliaCount - Number of millia- groups.
+ * @returns string The decillions prefix.
+ */
+const makeDecillionsPrefix = (
+	decillions: number,
+	millions: number,
+	currentMillia: GroupPlace,
+	longestMilliaCount: GroupPlace,
+) => {
+	if (decillions === 0) {
+		return makeMillionsPrefix(millions, currentMillia, longestMilliaCount);
+	}
+
+	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
+	const tensName = DECILLIONS_PREFIXES[decillions] as DecillionsPrefix;
+	return `${onesPrefix}${tensName}` as const;
+};
+
+/**
+ * Builds a name for numbers in the centillions.
+ * @param centillions - Centillions digit.
+ * @param decillions - Decillions digit.
+ * @param millions - Millions digit.
+ * @param currentMillia - Current millia- group.
+ * @param longestMilliaCount - Number of millia- groups.
+ * @returns string The centillions prefix.
+ */
+export const makeCentillionsPrefix = (
+	centillions: number,
+	decillions: number,
+	millions: number,
+	currentMillia: GroupPlace,
+	longestMilliaCount: GroupPlace,
+) => {
+	if (centillions === 0) {
+		return makeDecillionsPrefix(decillions, millions, currentMillia, longestMilliaCount);
+	}
+
+	const onesPrefix = MILLIONS_PREFIXES[millions] as MillionsPrefix;
+	const tensName = DECILLIONS_PREFIXES[decillions] as DecillionsPrefix;
+	const hundredsName = CENTILLIONS_PREFIXES[centillions] as CentillionsPrefix;
+	return `${hundredsName}${onesPrefix}${decillions > 0 ? tensName : ''}` as const;
+};
+
+/**
+ * Repeats a string a given number of times.
+ * @param s - String to repeat.
+ * @param count - Number of times to repeat the string.
+ * @returns string The repeated string.
+ */
+export const repeatString = (s: string, count: GroupPlace) => {
+	let result = '';
+	for (let i = BigInt(0); i < count; i += BigInt(1)) {
+		result += s;
+	}
+	return result;
+};
+
+export interface StringifyGroupsOptions {
+	/**
+	 * Whether to add dashes between tens and ones (e.g. "sixty-nine").
+	 */
+	addTensDashes?: boolean;
+	/**
+	 * Use "millia^2-tillion" instead of "milliamilliatillion".
+	 */
+	shortenMillia?: boolean;
+}
+
+export interface MergeTokensOptions {
+	oneGroupPerLine?: boolean;
+}
+
+/**
+ * Formats the final tokenized string.
+ * @param tokens - The tokens to finalize.
+ * @param options - The options to use.
+ */
+export const mergeTokens = (tokens: string[], options?: MergeTokensOptions) => (
+	tokens
+		.map((t) => t.trim())
+		.join(options?.oneGroupPerLine ? '\n' : GROUP_SEPARATOR)
+		.trim()
+);
+
+/**
+ * Makes a negative string.
+ * @param s - The string to make negative.
+ */
+export const makeNegative = (s: string) => {
+	const negativePrefix = `${NEGATIVE} `;
+	return s.startsWith(negativePrefix) ? s.slice(negativePrefix.length) : `${negativePrefix}${s}`;
+};