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export const identity = <T>(x: T): T => x;
export const defined = <T>(x: T | undefined | null): x is T =>
x !== undefined && x !== null;
export const instanciate = <T, A>(C: new (arg: A) => T): (arg: A) => T => {
return (arg: A): T => new C(arg);
};
export const get = <T extends Record<K, unknown>, K extends PropertyKey>(
key: K,
): (obj: T) => T[K] =>
(obj: T): T[K] => obj[key];
export const getCall = <
T extends Record<K, (...args: unknown[]) => unknown>,
K extends PropertyKey,
>(
key: K,
...args: Parameters<T[K]>
): (obj: T) => ReturnType<T[K]> =>
(obj: T): ReturnType<T[K]> => obj[key](...args) as ReturnType<T[K]>;
export const pass = <T>(fn: (x: T) => void): (x: T) => T => (x: T): T => {
fn(x);
return x;
};
export const equal = <T>(x: T): (y: T) => boolean => (y: T): boolean => x === y;
export const extremeBy = (arr: number[], mode: "max" | "min"): number =>
Math[mode](...arr);
export const transform = <T, U>(x: T, y: (x: T) => U): U => y(x);
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