SwiftUI Test 2
What will the numbers constant contain when this code is run?
Explanation:
The code runs through all of the numbers in the array and creates a new array for each one that includes the same number twice. As a result, 1 will become [1, 1], and so on.
Integers are stored in how many bits?
Explanation:
On 32-bit devices, such as the iPhone 5 and older, Swift's integers are 32-bit, and 64-bit on 64-bit devices, such as the iPhone 5s and beyond.
What will the code below yield as a result?
Explanation:
stride() is handy for traversing a set of numbers. It will count from 1 through (but not including) 17 in this case, incrementing by four each time.
Which of the following methods for creating a raw string in Swift is correct?
Explanation:
Swift's raw strings have the same number of # symbols at the beginning and end, making it easier to utilize quote marks and backslashes.
What data type will be allocated to result in the code below?
Explanation:
The UInt8.addingReportingOverflow() method returns a tuple (UInt8, Bool) that contains the result of the add operation as well as if an overflow occurred.
What will the numbers constant contain when this code is run?
Explanation:
A call to map code loops through the numbers array, creating a new array for each number that includes the same number twice. As a result, 1 will become [1, 1], and so on. We're using flatMap in this case, which flattens the resulting array of arrays into a single array, transforming [[1, 1]] into [1, 1], and so on.
What is the output of the following code?
Explanation:
This code assigns the welcome() method to the greetCopy constant, allowing you to use greetCopy() in the same way you would greet() ().
What will the code below yield as a result?
Explanation:
Despite the fact that we declared the NSMutableDictionary to be constant, it is a reference type that will gladly mutate regardless of its ostensibly "constant" status. As a result, this code will return 1 because the value was correctly added.
What data type does convertedNumber have when this code is run?
Explanation:
If the text doesn't contain a valid number, creating an integer from it will fail. So, this constructor gives you an Int value? to offer you a number (if you're successful) or a zero (if you're unsuccessful) (on failure.)