Sponge Bob casing util

spongeBobCase.ts

/** Takes a string and returns it's upper case */
export const upperCase = <const Source extends string>(source: Source) =>
	source.toLocaleUpperCase() as Uppercase<Source>;

/** Takes a string and returns it's lower case */
export const lowerCase = <const Source extends string>(source: Source) =>
	source.toLocaleLowerCase() as Lowercase<Source>;

/** Takes a `from` and a `to` and returns a random integer. */
export const randomNumber = (from: number) => (to: number) =>
	Math.round(Math.random() * Math.abs(to - from)) + Math.min(from, to);

/** Gets a random index from the given array. */
export const randomIndex = <Item>(source: ReadonlyArray<Item>) =>
	randomNumber(0)(source.length - 1);

/** Runs a random function of the given list of functions */
export const randomFunction =
	<Source, Output>(functions: ReadonlyArray<(source: Source) => Output>) =>
	(source: Source) =>
		functions[randomIndex(functions)](source);

/** Runs a function in every character of a string */
export const stringMap =
	(mapper: (item: string) => string) => (source: string) =>
		[...source].map(mapper).join("");

/** SPOnGE BoB cAse a StRInG */
export const spongeBobCase = stringMap(randomFunction([upperCase, lowerCase]));