For loop

⇒ For loop

• The for loop iterates through anything that provides an iterator.

for (item in Collection) print(item)

• The body can be block

for (item : Int in ints){
		// ... 
}

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

for(i in 1..3){                
		println(i)
}

for (i in 6 downTo 0 step 2) {
println(i)
}

• downTo - used in for loop to iterate in decresing order

• step - defualt is 1 , but you can set acording ,

• if step n is given , step will skips n index and goes to next iteration then again skip next n iteration

• If you want to iterate through an array or a list with an index, you can do it this way:

fun main() {
		val array = arrayOf("a", "b", "c")

		for (i in array.indices) {
			println(array[i])
		}
}

• Alternatively, you can use the withIndex library function:

fun main() {
		val array = arrayOf("a", "b", "c")

		for((index, value) in array.withIndex()) {
			println("the element at $index is $value")
		}
}

Kotlin For Loop

W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.

https://www.w3schools.com/kotlin/kotlin_for_loop.php