// const arrayMap = (array: any[], callback: (item: any, index: number, arr: any[]) => any): any[] => {
//   let i = -1
//   const len = array.length
//   const resArray = []
//   while (++i < len) {
//     resArray.push(callback(array[i], i, array))
//   }
//   return resArray
// }
// export = arrayMap

const arrayMap = <T, U>(array: T[], callback: (item: T, index: number, arr: ReadonlyArray<T>) => U): U[] => {
    let i = -1
    const len = array.length
    const resArray = []
    while (++i < len) {
      resArray.push(callback(array[i], i, array))
    }
    return resArray
  }
export = arrayMap