Master WHILE, DO/WHILE and FOR LOOPS in ANDROID KOTLIN with THIS

Veröffentlicht am: 01 Januar 1970
auf dem Kanal: tutorialsEU - Android

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while and do-while loops execute their body continuously while their condition is satisfied. The difference between them is the condition checking time:

while checks the condition and, if it's satisfied, executes the body and then returns to the condition check.

do-while executes the body and then checks the condition. If it's satisfied, the loop repeats. So, the body of do-while executes at least once regardless of the condition.

The for loop iterates through anything that provides an iterator. This is equivalent to the foreach loop in languages like C#.

The body of for can be a block.

As mentioned before, for iterates through anything that provides an iterator. This means that it

· has a member or an extension function iterator() that returns Iterator

· has a member or an extension function next()

· has a member or an extension function hasNext() that returns Boolean.

All of these three functions need to be marked as operator.

To iterate over a range of numbers, use a range expression

A for loop over a range or an array is compiled to an index-based loop that does not create an iterator object.

Alternatively, you can use the withIndex library function

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