Loops in swift

Telling the same story for the nth time

Loops are among the most basic and powerful programming concepts. A loop in a computer program is an instruction that repeats until a specified condition is reached. In a loop structure, the loop asks a question. If the answer requires action, it is executed. The same question is asked again and again until no further action is required. Each time the question is asked is called an iteration.loops are entry check and exit check.

The for-in loop iterates over collections of items, such as ranges of numbers, items in an array, or characters in a string.

In the above program, the inclusive part is being determined by the number of 3 dots between both numbers.

If you do not need to include 10, then use 2 dots followed by less then symbol ( ..<).

In the above program, eachNamerepresents every element in an array.

In this program, eachIndexrepresents the index of the array.

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A while loop repeatedly executes a target statement as long as a given condition is true.

The repeat while loop checks the condition at the end of the loop. Difference between while and repeat while is, in repeat while that the statements inside the loop body will be executed at least once even if the condition is never true.

In repeat while loop, the statements in the loop execute once before the condition is tested. If the condition is true, the control flow jumps back up to repeat, and the statements in the loop execute again. This process repeats until the given condition becomes false.

You can exit a loop at any time using the breakkeyword. When a break statement is encountered inside a loop, the loop is immediately terminated.

If you are using nested loops, then the break statement will stop the execution of the innermost loop and start executing the next line of the code after the block.

break

in the above program, once we get a number is 16 then the rest of the loop gets skipped.

If you put a loop inside a loop it’s called a nested loop. If you want to exit both the outer and inner loop at the same time is not an easy way. But we use the following way it is easy to break both loops at the same time.

The continuestatement skips some lines of code inside the loop and continues with the next iteration. It is mainly used for a condition so that we can skip some code for a particular condition.

continue

In the above program, when we get eachValues % 2 == 0then skips the current line and continues with the next iteration.

To make an infinite loop, just use it as your condition. true is always true, so the loop will repeat forever.

Please make sure you have a check that exits your loop, otherwise it will never end.

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