export const reverse = <T>(s: T[]) => s.slice().reverse();

export const filter =
   <T>(predicate: (value: T, index: number, array: T[]) => boolean) =>
   (s: T[]) =>
      s.filter(predicate);

export const push =
   <T>(item: T, maxSize?: number) =>
   (s: T[]) =>
      maxSize === undefined || s.length < maxSize
         ? [...s, item]
         : [...[...s, item].slice(s.length + 1 - maxSize, s.length + 1)];

export const unshift =
   <T>(item: T, maxSize?: number) =>
   (s: T[]) =>
      maxSize === undefined || s.length < maxSize
         ? [item, ...s]
         : [item, ...s.slice(0, maxSize - 1)];

export const updateObj =
   <T extends { [k: string]: any }>(item: Partial<T>, match: Partial<T>) =>
   (s: T[]) =>
      s.map(el => (Object.keys(match).every(k => match[k] === el[k]) ? { ...el, ...item } : el));

export const removeObj = <T extends { [k: string]: any }>(match: Partial<T>) =>
   filter<T>(el => !Object.keys(match).every(k => match[k] === el[k]));

//alias
export const pushTop = unshift;