You want to perform variable substitution into a string, like you can do with other languages, such as Perl, PHP, and Ruby.
Beginning with Scala 2.
Scala Cookbook by Alvin Alexander
This is shown in the println statement in the following example:. In addition to putting variables inside strings, you can include expressions inside a string by placing the expression inside curly braces. In the following example, the value 1 is added to the variable age inside the string:. The following example shows the correct approach:.
Attempting to print the values of the object fields without wrapping them in curly braces results in the wrong information being printed out:.
Though this seems slightly less convenient than just putting variables inside of strings, there are at least two benefits to this approach:. In the example in the Solution, the weight was printed as This is okay, but what can you do if you want to add more decimal places to the weight, or remove them entirely? The following examples show how to print the weightfirst with two decimal places:.
Use printf style formatting specifiers immediately after your variables. For instance, you can assign the result of a variable substitution to a new variable, similar to calling sprintf in other languages:. In addition to the s and f string interpolators, Scala 2. In addition to the sfand raw interpolators that are built into Scala 2. See the official Scala String Interpolation documentation for an example of how to create your own interpolator.
String interpolation does not work with pattern-matching statements in Scala 2. This feature is planned for inclusion in Scala 2. Prior to version 2. If you need to use a release prior to Scala 2. Just as with the string interpolation capability shown in the Solution, you can use this approach anywhere you want to format a string, such as a toString method:.
With either of these approaches, you can format your variables using all the usual printf specifiers. This printf cheat sheet shows more format specifiers and examples. This Oracle Formatter page shows examples and details.
The official Scala String Interpolation documentation.Console implements functions for displaying the stated values on the terminal i. It is also utilized in reading values from the Console with the function from scala. It is even helpful in constructing interactive programs. The println and Console. Here, the while loop is infinite in nature and after giving user inputs the variable will contains that GfG string and if again we given any input then the variable will contain that Nidhi input.
Writing code in comment? Please use ide. Skip to content. Related Articles. Last Updated : 10 Apr, Print: It is equivalent to println but it does not computes any trailing line. It puts down the data to the beginning of the line. Recommended Articles. Scala SortedMap addString method with a start, a separator and an end with example.
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Scala format and formatted Strings Use the formatted and format methods on format strings to insert values in placeholders. A string has values in it. For example, with "10 cats" we have the value 10, and some following text. With format, and formatted, we transform values and add surrounding text. Standard format codes. In Scala we keep the same format codes. Formatted example. Let us begin with a simple example. We have a number 10 specified with the val keyword.
We call formatted on this Int. Tip The formatted method can be called on any object—so we can use it on an Int, Double or String value. Argument We pass a special format string to the formatted method.
This uses the same format as String. Format method. This is called on a format string. We pass it arguments that are placed in the format insertion codes. Here we apply right and left padding to Ints and strings to justify text. For padding, we use the "s" and "10s" format codes for right and left padding insertions. Java The format method accepts the same format codes as the Java String. Reorder, repeat values. We can use a format string and the format method to reorder and repeat values in a string.
Consider this example. We have 3 insertions. And The second argument to format, "cat," is repeated twice. The first argument "frog" is inserted after the second. Java notes. A key advantage to Scala is that it can use the full power of the JVM. It is built on the JVM. We can use the format syntax from Java. A summary. Formatting strings in Scala is done in a standard way with the same literal syntax as Java. But with formatted we can format values in a clearer way—with just a method call.Home Search Scala Console: println, printf and readLine Use console functions like println and printf.
Read lines from the console. Scala Console: println, printf and readLine Use console functions like println and printf. A program does something. It computes the chance your investment will increase or decrease in value. We must write this value to the console—or it will remain unknown. Method notes.
With print, println and printf we report to the screen. And with methods from scala. StdIn we read data from the console. We build interactive programs. Println example. With the print methods we write data like Strings or Ints to the screen. Here we use 3 print functions—we do not need to access the Console type directly.
Println This writes a value to the console and adds a trailing newline. We can pass Strings, Ints or other types to it. Print This is the same as println but it adds no trailing newline. It just writes the data to the start of a line. Printf This writes a format string and inserts additional arguments. It is similar to the Java String. Here we get input from the user in the form of a string. The predefined readLine is deprecated, so we must access Scala.
StdIn for a better version. Here Control flow stops once readLine is invoked. Type something like "cat" and press return. The variable now contains that string.In this tutorial, we will go over String interpolation in Scala which allows us to easily print and format variables and expressions.Fisheye projection
Make sure you have reviewed the previous tutorial on how to declare immutable variables as we will be using them here. Using String interpolation to evaluate expressions Similar to step 2, you can use String interpolation with expressions by using the curly braces. In the example below, we check to see if we are buying 10 donuts:.
This can be achieved using the f interpolation as follows:. Using f interpolation to format numbers As an example, let's first print the price of one donut using the s interpolation:. But, what if we wanted to print the 2 decimal places for the donutPrice variable. This can be achieved by using the f interpolator.
Stay in touch via Facebook and Twitter for upcoming tutorials! The source code is available on the allaboutscala GitHub repository. In the next tutorialI will show you how to escape quotes in String.Camels with two humps or one
By Nadim Bahadoor Last updated: March 16, at am. Overview In this tutorial, we will go over String interpolation in Scala which allows us to easily print and format variables and expressions.
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For now you can think of case class as a means for creating domain objects where the Scala compiler does the hardwork of adding your getters and setters! If you've used.
Scala String Interpolation - Print And Format Variables
NETit's similar to creating domain objects but without having to define boilerplate properties for getters and setters. Don't forget to like and share this page :.
Summary In this article, we went over the following: How to print variables using the s String interpolation. How to print object properties using String interpolation. How to format strings using the f String interpolation. How to use the raw String interpolation Tip This tutorial was inspired by the String interpolation Scala documentation. Source Code The source code is available on the allaboutscala GitHub repository. What's Next In the next tutorialI will show you how to escape quotes in String.
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In this Scala tutorial, we will learn about all three methods to print a line is Scala along with sample code for each. These limitations and where you should and should not use them. Submitted by Shivang Yadavon July 04, To print a line in Scalathere are majorly three inbuilt methods that can help you print your string to the output string.
You can use any of them in your code as they are inbuilt in Scala. The syntax for printing statements using printf method is:. There are some limitations in this like does not provide a line break at the end of the statement, deals in traditional coding that is a bit tricky. The print method in Scala is just like print one, but the method of the passing string is a bit different.
For example. This method is a bit easy to write for the programmer and it does not require passing references.
But this does not add a line break at the end of the line. The println method is used to print a statement and add a line break to it at the end by default.
All functioning is the same but your code will add a line break and the cursor will move to the next line. If you need to format your output code to make it look good. Comments and Discussions. A humble request Our website is made possible by displaying online advertisements to our visitors. Please consider supporting us by disabling your ad blocker on our website. Net VB. Subscribe Ask a Question.Join Stack Overflow to learn, share knowledge, and build your career.
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