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isalpha

isalpha(c::Union{Char,AbstractString}) -> Bool

Tests whether a character is alphabetic, or whether this is true for all elements of a string. A character is classified as alphabetic if it belongs to the Unicode general category Letter, i.e. a character whose category code begins with 'L'.

Examples

1. Check if a character is alphabetic:

   julia> isalpha('a')
   true

2. Check if all characters in a string are alphabetic:

   julia> isalpha("hello")
   true

3. Handle non-alphabetic characters in a string:

   julia> isalpha("hello, world!")
   false

   It returns false because the string contains non-alphabetic characters (',', ' ' and '!').

4. Check if a character is alphabetic using a variable:

   julia> c = 'A'
   'A'
   
   julia> isalpha(c)
   true

   The variable c holds the character 'A', and isalpha returns true for alphabetic characters.

Common mistake example:

julia> isalpha(65)
ERROR: MethodError: no method matching isalpha(::Int64)

In this example, the input to the isalpha function is an integer instead of a character or string. It's important to provide a character or string as input to the function to avoid this error.

See Also

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