export function noop() {
} // tslint:disable-line

export function same(o: any) {
  return o
}

export function is(x: any, y: any) {
  if (x === y) {
    return x !== 0 || 1 / x === 1 / y
  } else {
    return x !== x && y !== y
  }
}

export function range(size: any = 50, start: any = 0, step: any = 1) {
  const arr = []
  for (let i = 0; i < size; i += 1) {
    arr[i] = i + start
  }
  return arr
}

export function oneOf(actual: any, expected: any) {
  if (!Array.isArray(expected)) {
    return new Error(
      'Invalid argument supplied to oneOfType: expected an instance of array',
    )
  }
  if (expected.filter((value) => is(actual, value)).length === 0) {
    return false
  }
  return true
}

export function o2a(obj: { [key: string]: any }) {
  return Object.keys(obj).map((key) => ({ key, value: obj[key] }))
}

export function a2o(arr: any) {
  return arr.length === 0 || arr.length === 1
    ? { [arr[0].key]: arr[0].value }
    : arr.reduce((a: any, b: any) => {
      return Object.assign(a, { [b.key]: b.value }) // tslint:disable-line
    }, {})
}

export function isPromise(value: any) {
  if (value !== null && typeof value === 'object') {
    return value && typeof value.then === 'function'
  }

  return false
}

export function debounce() {
  // todo
}

export function throttle() {
  // todo
}