Kotlin String Template

Lets learn about one of the awsome feature of Kotlin, String Templates !  This feature allows Strings to contain template expression.

One way to write code like below using string concatenation in java (which works in Kotlin as well)

package stringtemplate

fun main(args: Array<String>) {
    val carName = "BMW 5 Series"
    val carModel = "Saloon 3.0"
    val carPrice = 68000
    println(carName + " car of model " + carModel + " cost up to " + carPrice + " Euros")
}

With String Templates life will be much easier and code will be more readable, basically String Templates syntax in Kotlin used to dynamically embed variables and expressions into a string as your code executed.

package stringtemplate

fun main(args: Array<String>) {
    val carName = "BMW 5 Series"
    val carModel = "Saloon 3.0"
    val carPrice = 68000
    println("$carName  car of model $carModel cost up to $carPrice Euros")
}

Output of both above code sample will be exactly same. 

Unlike Java, many of Kotlin’s constructs (not all) are expressions. Therefore, a String template may contain conditions or logic. This is one of the major advantage of Kotlin over Java.

Lets see this in action via even/odd example 

public class Condition {
    public static void main(String[] args) {
        int x =101;
        if (x % 2 == 0)
            System.out.println("The number " + x +" is even.");
        else
            System.out.println("The number " + x +" is odd.");
    }
}

With Kotlin, the same code can be written as 

fun main(args: Array<String>) {
    val x = 101
    println("The number $x is ${if(x % 2 == 0) "even." else "odd."}")
}

That's all for this short lesson

Code for this blog can be found here.

Learn more about Kotlin from Official Kotlin site: