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Loop Statements execute its Body multiple times (while condition is TRUE or while iterating through Elements)
● for…in Statement iterates through Sequence or Array Elements and executes its Body for each Element.
● while Statement executes its Body while condition is TRUE. Condition is checked at the beginning of Body
● do .. while Statement executes its Body while condition is TRUE. Condition is checked at the end of Body.
You can use
● break Jump Statement to exit Loop Statement
● continue Jump Statement to skip rest of the Body and continue with next iteration from the beginning of Body
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for…in can be used to iterate through Elements of Sequence or Array.
Iterate through Sequence Elements
for (i in 1..5 ) { println(i) } // 1 2 3 4 5
for (i in 1..5 step 2) { println(i) } // 1 3 5
for (i in 6 downTo 0 step 2) { println(i) } // 6 4 2 0
Iterate through Array Elements
val people = arrayOf("John", "Lucy", "Bob") // DECLARE ARRAY
for (person in people ) { println(person) } // John Lucy Bob
for (index in people.indices ) { println(people[index]) } // John Lucy Bob
for ((index, value) in people.withIndex()) { println("$index = $value") } // 0 = John, 1 = Lucy, 2 = Bob
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while checks conditions at the beginning of the Body.
while
var i = 0
while(i < 5) {
i++
println(i)
}
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do .. while checks conditions at the end of the Body.
do .. while
var i = 0
do {
i++
println(i)
} while(i < 5)
