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The Rust Programming Language, 2nd Edition
In Erlang, an empty string can be printed by simply using double quotation marks without any content inside them. Here is an example of how to print an empty string in Erlang:
io:format("~s~n", [""]).
In the above code, the io:format/2 function is used to print a string. The format specifier ~s is used to indicate that we want to print a string, and ~n is used for a newline. The empty string is passed as an argument in a list [""] to the io:format/2 function.
When you run the above code, it will output an empty string to the console:
(blank line)
This is how you can print an empty string in Erlang.
How to check if an empty string is alphanumeric in Erlang?
In Erlang, you can use the is_atom/1 and is_alphanumeric/1 functions to check if a string is alphanumeric or not.
To check if an empty string is alphanumeric, you can use the following code:
is_empty_alphanumeric(Str) -> is_atom(Str) andalso is_alphanumeric(binary_to_list(Str)).
Here, the binary_to_list/1 function is used to convert the binary string into a list of characters, which is then checked for alphanumeric characters using the is_alphanumeric/1 function.
Here is an example usage of the is_empty_alphanumeric/1 function:
Eshell V11.1.8 (abort with ^G)
1> is_empty_alphanumeric("").
false
In the example above, the empty string "" is passed to the is_empty_alphanumeric/1 function, which returns false since an empty string is not alphanumeric.
How to compare an empty string with another string in Erlang?
To compare an empty string with another string in Erlang, you can use the == operator. Here is an example:
compare_strings(EmptyString, OtherString) -> if EmptyString == OtherString -> io:format("Both strings are equal.~n"); EmptyString /= OtherString -> io:format("Both strings are not equal.~n") end.
In this example, the function compare_strings/2 takes two parameters: EmptyString and OtherString. It uses the == operator to check if the two strings are equal. If they are equal, it prints "Both strings are equal.", and if they are not equal, it prints "Both strings are not equal.".
How to convert an empty string to uppercase in Erlang?
In Erlang, you can use the built-in string:to_upper/1 function to convert an empty string to uppercase. However, this function will return an empty string as the result since there are no characters to convert. Here's an example of how to use it:
1> string:to_upper(""). ""
In the above example, string:to_upper("") returns "" because there are no characters to convert to uppercase.
What is the transformed empty string after a substring replacement in Erlang?
In Erlang, the transformed empty string after a substring replacement depends on the replacement operation being used. If you are using the re:replace/4 function from the re module to replace substrings with a given pattern, the transformed empty string will remain empty.
For example:
re:replace("", "pattern", "replacement", [global]).
In this case, the result would be an empty string "".
Note that if the replacement pattern does not match any substring in the original string, the result will still be an empty string.
However, if you are using a different substring replacement operation or a user-defined function, the transformed empty string could have a different value depending on the specific implementation.
What is the uppercase representation of an empty string in Erlang?
The uppercase representation of an empty string in Erlang is an empty string itself, represented as an empty list in Erlang syntax. Here is an example:
EmptyString = "".
Empty string is represented by an empty list [].
What is the effect of concatenating an empty string in Erlang?
In Erlang, concatenating an empty string ("") with any other string results in the original string. This means that there is no effect on the original string when concatenating it with an empty string. Here's an example to illustrate this:
String = "Hello, ", EmptyString = "", Result = String ++ EmptyString.
In this case, Result will be "Hello, " which is the same as the original String.