Swift cycle
Sometimes, we may need to execute the same piece of code multiple times. In general, statements are executed sequentially: the first statement in the function is executed first, then the second statement, and so on.
Programming languages provide a variety of control structures for more complex execution paths.
Loop statements allow us to execute a statement or group of statements multiple times. Here is a flowchart of loop statements in most programming languages:
Cycle type
The Swift language provides the following loop types. Click the link to viewa detailed description of each type:
Cycle type |
Description |
|---|---|
For-in |
Iterate through all the elements in a set, such as intervals represented by numbers, elements in an array, characters in a string. |
For cycle |
Used to repeat a series of statements until specific conditions are met, usually by increasing the value of the counter after each loop is completed. |
While cycle |
Run a series of statements that, if the condition is true, run repeatedly until the condition becomes false. |
Repeat…while cycle |
A similar while statement differs from a block of code that executes a loop before determining a loop condition. |
Loop control statement
Loop control statements change the order in which your code is executed, through which you can jump the code. Swift has the following loop control statements:
Control statement |
Description |
|---|---|
Continue statement |
Tell a loop body to stop this loop iteration immediately and restart the next loop iteration. |
Break statement |
Interrupts the current loop. |
Fallthrough statement |
If you continue to execute the following case after a case has been executed, you need to use the fallthrough keyword. |