Step by Step solution about How to resolve the algorithm Literals/String step by step in the Haskell programming language

The provided Haskell code demonstrates the use of string literals and raw string literals to define multiline strings. Here's a breakdown of each part:

String Literals:

"abcdef" == "abc\
           \def"

In Haskell, you can use string literals to represent sequences of characters enclosed in double quotes (""). The backslash character (\) is used for line breaks, allowing you to create multiline strings. However, the backslash also acts as an escape character, so \n represents a newline character in the string.

In this example, the two string literals are compared for equality. The first string, abcdef, is a single line, while the second string, abc\ def, is actually a multiline string. The backslash creates a line break, so the second string is effectively "abc\ndef".

When comparing the two strings, Haskell ignores the leading and trailing whitespace, including the newline character. Therefore, the comparison evaluates to True because the two strings are considered equivalent.

Raw String Literals:

"abc\ndef" == "abc\n\
             \def"

Raw string literals (introduced by r) allow you to define multiline strings without the need for backslash escapes. This can make it easier to write multiline strings without worrying about escaping special characters.

In this example, the two string literals are again compared for equality. The first string, abc\ndef, is a multiline string using backslash escapes. The second string, abc\n\ def, is a raw string literal that achieves the same effect without the backslashes.

Once again, the comparison evaluates to True because the two strings are considered equivalent despite using different syntax to define multiline strings.

QuasiQuotes:

{-# LANGUAGE QuasiQuotes #-}
import Text.RawString.QQ

"abc\ndef" == [r|abc
def|]

QuasiQuotes is a Haskell language extension that allows you to define strings using a more flexible syntax. By importing Text.RawString.QQ, you gain access to the [r| ... |] syntax for creating raw string literals.

In this example, the two string literals are compared for equality once more. The first string, abc\ndef, is the same as before. The second string, [r|abc\ndef|], is a quasiquoted raw string literal.

The quasiquoted string has the same effect as the previous raw string literal but uses a different syntax. The comparison evaluates to True as expected.

The advantage of using quasiquotes is that it allows for more flexible string interpolation and manipulation. You can use quasiquotes to embed Haskell expressions inside strings or create strings from other data structures.

"abcdef" == "abc\
            \def"

"abc\ndef" == "abc\n\
              \def"


{-# LANGUAGE QuasiQuotes #-}
import Text.RawString.QQ

"abc\ndef" == [r|abc
def|]