let numberList = [11, 12, 13, 14, 15,16]
for item in numberList{
print(item)
}
for item in numberList.enumerated(){
print(item.offset ,item.element)
}
for (index, item) in numberList.enumerated().reversed() {
print(index,item)
}
for i in 0..<5 {
print("--",numberList[i])
}
for i in 0...5{
print("==",i)
}
for i in (0...5).filter({ i in i % 2 == 1}) {
print("***",i)
}
for i in (0...5).filter({ $0 > 2}) {
print("###",i)
}
赠送一种数组截取方式
array(groups![startIndex...endIndex])