Summary of Scala Strings

Introduction to Strings in Scala

Strings in Scala are immutable sequences of characters. Once a String is created, it cannot be changed.

Key Concepts

Creation of Strings

Strings can be created using double quotes:

val str = "Hello, Scala!"

String Operations

Common operations that can be performed on Strings include:

Accessing Characters: Accessing specific characters using their index.

val firstChar = str.charAt(0) // Returns 'H'

Length: Finding the number of characters in a string.

val length = str.length() // Returns 13

Concatenation: Joining two strings.

val str1 = "Hello"
val str2 = "World"
val result = str1 + " " + str2 // "Hello World"

String Interpolation

Scala provides string interpolation for embedding variables directly within strings:

raw Interpolator: For raw strings, ignoring escape characters.

val rawString = raw"This is a newline: \n" // "This is a newline: \n"

f Interpolator: For formatted strings.

val pi = 3.14159
val formatted = f"Pi is approximately $pi%.2f" // "Pi is approximately 3.14"

s Interpolator:

val name = "Scala"
val greeting = s"Hello, $name!" // "Hello, Scala!"

String Methods

Some useful String methods include:

trim(): Removes leading and trailing whitespace.

val trimmed = "   Hello   ".trim() // "Hello"

toLowerCase(): Converts to lowercase.

val lower = str.toLowerCase() // "hello, scala!"

toUpperCase(): Converts to uppercase.

val upper = str.toUpperCase() // "HELLO, SCALA!"

Conclusion

Strings in Scala are powerful and flexible, allowing various operations and features like interpolation. Understanding string manipulation is essential for effective programming in Scala. By mastering these concepts, beginners can effectively work with strings in their Scala applications.