Strings

Strings in Kotlin behave in a similar way as in Java, but they have a few nice improvements.

To start to access characters at a specified index, we can use the indexing operator and access characters the same way we access array elements:

    val str = "abcd" 
    println (str[1]) // Prints: b 

We also have access to various extensions defined in the Kotlin standard library, which make working with strings easier:

    val str = "abcd" 
    println(str.reversed()) // Prints: dcba 
    println(str.takeLast(2)) // Prints: cd 
    println("john@test.com".substringBefore("@")) // Prints: john 
    println("john@test.com".startsWith("@")) // Prints: false 

This is exactly the same String class as in Java, so these methods are not part of String class. They were defined as extensions. We will learn more about extensions in Chapter 7, Extension Functions and Properties.