Loop In Swift - Learn Swift From Scratch - 03
here may be a situation when you need to execute a block of code several number of times. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.
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Programming languages provide various control structures that allow for more complicated execution paths.
A loop statement allows us to execute a statement or group of statements multiple times. of a loop statement in most of the programming languages −
loops
Swift programming language provides the following kinds of loop to handle looping requirements. Click the following links to check their detail.
The for-in loop iterates over collections of items, such as ranges of numbers, items in an array, or characters in a string −
Syntax
The syntax of a for-in loop in Swift 4 programming language is −
for index in var {
statement(s)
}
A while loop statement in Swift 4 programming language repeatedly executes a target statement as long as a given condition is true.
Syntax
The syntax of a while loop in Swift 4 programming language is −
while condition {
statement(s)
}
Unlike for and while loops, which test the loop condition at the top of the loop, the repeat...while loop checks its condition at the bottom of the loop.
A repeat...while loop is similar to a while loop, except that a repeat...while loop is guaranteed to execute at least once.
Syntax
The syntax of a repeat...while loop in Swift 4 is −
repeat {
statement(s)
}
while( condition )
