In Kotlin, you can use both for and while loops to iterate through items. Here is a quick overview of how you can use these loops with examples:

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1. Using a for Loop

A for loop is used to iterate through a range, array, list, or any iterable.

Iterating through a range:

for (i in 1..5) {
    println("Current number is $i")
}

• 1..5 creates a range from 1 to 5 (inclusive).
• You can also use until to exclude the end value:

for (i in 1 until 5) {
    println("Current number is $i") // 1 to 4
}

• To iterate in reverse, use the downTo keyword:

for (i in 5 downTo 1) {
    println("Countdown: $i")
}

• To skip steps, use the step keyword:

for (i in 1..10 step 2) {
    println("Step: $i")
}

Iterating through a list or array:

val items = listOf("Apple", "Banana", "Orange")
for (item in items) {
    println(item)
}

Iterating with index:

val items = arrayOf("A", "B", "C")
for ((index, value) in items.withIndex()) {
    println("Index: $index, Value: $value")
}

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2. Using a while Loop

A while loop is used when you want to execute a block of code as long as a condition is true.

Example of a while loop:

var counter = 1
while (counter <= 5) {
    println("Count: $counter")
    counter++
}

Example of a do-while loop:

The do-while loop ensures the block of code executes at least once.

var counter = 1
do {
    println("Count: $counter")
    counter++
} while (counter <= 5)

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Summary of Differences:

• for Loop: Best for iterating over ranges, collections, and when the number of iterations is known.
• while (and do-while) Loop: Best for scenarios where the number of iterations depends on a condition.