VoloshinS

export const moveInArray = <T>(arr: T[], fromIndex: number, toIndex: number): T[] => {
  if (toIndex === fromIndex || toIndex >= arr.length) return arr;

  const toMove = arr[fromIndex];
  const movedForward = fromIndex < toIndex;

  return arr.reduce((res, next, index) => {
    if (index === fromIndex) return res;
    if (index === toIndex) return res.concat(movedForward ? [next, toMove] : [toMove, next]);

VoloshinS

export const promiseSerial = funcs =>
  funcs.reduce((promise, func) =>
    promise.then(result => func().then(Array.prototype.concat.bind(result))),
    Promise.resolve([]));

VoloshinS

const lessThen = (p) => (a) => a < p;
const greaterThen = (p) => (a) => a > p;

const quicksort = ([p, ...xs]) =>
  (p === undefined) && !xs.length ? [] : [ ...quicksort(xs.filter(lessThen(p))), p, ...quicksort(xs.filter(greaterThen(p))) ]

VoloshinS

componentWillReceiveProps(nextProps) {
  const log = key => {
    this.props[key] !== nextProps[key] && console.log(key, this.props[key], nextProps[key]);
  };
  console.log('===================');
  Object.keys(this.props).map((i) => log(i));
  console.log('===================');
}