Kotlin Strings

Strings in Kotlin represent an array of characters.
Strings are immutable. It means operations on string produces new strings.
We can create string as follows in Kotlin.

val x: String = "Hello World"

Or we can create a multi line string as follows.

val x: String = """The
Quick
Brown
Fox"""

String templates:
String templates is a powerful feature in Kotlin when a string can contain expression and it will get evaluated.
Example:

fun main(args: Array<String>) {
    val x: String = "Iceberg"
	val y: String = "My name is $x"
	println(y)
}

Output:
My name is Iceberg

We can get a particular character from String using index operator [].

fun main(args: Array<String>) {
    var y: String = "Hello"
	var x: Char
	x = y[1]
	print(x)
}

Output:
e

You can iterate a string using for statement in Kotlin.

fun main(args: Array<String>) {
    var str1: String = "Hello"
	for(item in str1)
	{
		println(item)
	}
}

Output:
H
e
l
l
o

Common String operations in Kotlin.

fun main(args: Array<String>) {
    var s: String = "Hello"
	println("Length of string $s is ${s.length}")
	println("Init cap of string is  ${s.capitalize()}")
	println("Lower case is ${s.toLowerCase()}")
	println("Upper case is ${s.toUpperCase()}")
}

Output:
Length of string Hello is 5
Init cap of string is Hello
Lower case is hello
Upper case is HELLO