Swift face questions and their answers

written Questions

Beginner

question 1, (problem with Swift 1.0 and later) has a better way to write the following for loop.

1 2 3

for var i = 0; I < 5; i++ {print ("hello!")}

Answer:

1 2 3

For _ in 0...4 {print ("hello!")}

Swift implements two array operators closed operator and Half-operator. The former contains all the values in the array. For example: The following example contains all integers from 0 to 4:

1

0...4

Half-operator does not contain the last element in the array, the following example will get the same result as above: