Swift for Beginners Part 6 - Loops
Loops in Swift
In this lesson, we will be discussing loops in Swift. We will cover the two most common types of loops: for-in and while loops.
For-In Loop
- A loop that goes over a particular operation multiple times.
- Used to avoid having as many lines of code as there are numbers.
- Syntax:
for thing in collection do something.
- Example: Multiplying each number in a collection by 2 using a for-in loop.
- Create an array called "numbers" with values 1, 2, 3, 4, and 5.
- Use a for-in loop to iterate over each element in the "numbers" array.
- Multiply each element by 2 and print out the result.
While Loop
- A loop that executes a block of code repeatedly until a specified condition is met.
- Syntax:
while condition do something.
- Example: Printing out "called" continuously using a while loop.
- Create a variable called "X" with an initial value of zero.
- Use a while loop to continuously print out "called" as long as X is less than three.
Introduction to Loops
In this section, the instructor introduces loops and their practical applications.
How Loops Work
- A while loop is used to print something while a certain condition is true.
- The block of code within the loop will continue to execute until the condition is no longer true.
- The number of times the loop executes depends on how many times the condition is met.
Practical Applications of Loops
- Loops are useful for iterating over large collections of data, such as a list of messages that need to be deleted.
- There are many other ways in which loops can come in handy, and they will be encountered throughout the course.
Conclusion
In this section, the instructor wraps up the lesson and encourages viewers to leave comments or start a discussion if they need help with any of the material covered.
Wrapping Up
- The lesson concludes with a brief summary of what was covered and an invitation for viewers to leave feedback or ask questions.