export class ArrayUtil {

  public static countItem(item: any, array: any[]): number {
    let count: number = 0
    for (let itemInArray of array) {
      if (itemInArray === item) {
        count++
      }
    }
    return count
  }

  public static addUniqueItem(value: any, array: any[]): boolean {
    if (array.length === 0) {
      array.push(value)
      return true
    } else {
      let count: number = ArrayUtil.countItem(value, array)
      if (count === 0) {
        array.push(value)
        return true
      }
    }
    return false
  }

  public static removeItem(item: any, array: any[]): boolean {
    let itemDeleted: boolean = false
    for (let i: number = 0; i < array.length; i++) {
      if (array[i] === item) {
        array.splice(i, 1)
        itemDeleted = true
      }
    }
    return itemDeleted
  }

  public static copy(array: any[]) {
    let result: any[] = new Array
    for (let i: number = 0; i < array.length; i++) {
      result[i] = array[i]
    }
    return result
  }

}