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Mari Cruz
Asked: 2020-08-04 07:04:57 +0800 CST 2020-08-04 07:04:57 +0800 CST

How to determine if a function argument is uppercase, lowercase, or both?

  • 772

Hello, I want to know if there is any method in the functions to determine if the argument that I pass it, would be a text string, is made up of uppercase, lowercase or if it is made up of uppercase or lowercase. I want to make a function that tells me if the arguments I pass it, in this case a text string, and get to know if it has uppercase, lowercase or both kinds of letters. This is what has occurred to me so far, but I still have to know how I distinguish the letters (uppercase and lowercase, or both) It would be a lot, if I managed to digest how many there are of each class, since there are uppercase and lowercase letters. I only managed to make the approach. An orientation of how to proceed, or where I can look for documentation. Look at https://www.w3schools.com/js/js_function_parameters.aspand MDN but I don't know if I didn't look for it well, I didn't find a way to achieve my purpose.

function distingueLetras (argumentos) {
    if (argumentos == son minusculas) {
        console.log(`La palabra esta compuesta de minusculas`)
    }  else if(argumentos == son mayusculas){
        console.log('la esta compuesta de mayusculas')
    } 
    else {
        console.log(`la palabra esta compuesta de ${x} mayusculas y ${y} minusculas`)
    }

}
distingueLetras('hoy hace mucho calor')
distingueLetras('Aqui ESTAmos a 35 Grados')
distingueLetras('A LA PISCINA)

javascript

3 Answers

  1. Best Answer

    You can do this using toLowerCase()and toUpperCase()which return the string in lowercase and uppercase respectively, and charCodeAt()which returns the number indicating the Unicode value.

    The Unicode code range is from 0 to 1,114,111. The first 128 codes of Unicode match directly with the character codes of the ASCII encoding.

    And looking at the ASCII table you can see that the numbers from 65 to 90 belong to the uppercase letters of the alphabet, while from 97 to 122 belong to the lowercase letters.

    For example:

    var unicode = "a".charCodeAt();
console.log(unicode);

    This prints 97. Having that, you can iterate through stringto get the uppercase and lowercase letters.

    Solution:

    function distingueLetras (argumentos) {
  // compruebo si el string es igual al string puesto en minúsculas
  if (argumentos === argumentos.toLowerCase()) {
    console.log('La palabra esta compuesta de minusculas');
  }
  // compruebo si el string es igual al string puesto en mayúsculas
  else if (argumentos === argumentos.toUpperCase()) {
    console.log('la esta compuesta de mayusculas');
  } else {
    var x = 0;
    var y = 0;
    
    // recorro el string
    for (var i = 0; i < argumentos.length; i++) {
      var charCode = argumentos[i].charCodeAt();
      
      // si pertenece a las mayúsculas
      if (charCode >= 65 && charCode <= 90) {
        x++;
      }
      // si pertenece a las minúsculas
      else if (charCode >= 97 && charCode <= 122) {
        y++;
      }
    }
    console.log(`la palabra esta compuesta de ${x} mayusculas y ${y} minusculas`)
  }

}

distingueLetras('hoy hace mucho calor')
distingueLetras('Aqui ESTAmos a 35 Grados')
distingueLetras('A LA PISCINA')

    • 1

  2. You can loop through the entire string (argument) and ask if it's uppercase or lowercase, then decide what to do with the result

    let mayus=0;
let minus=0;

for (int i=0;i<argumento.length;i++)
    {
        if(argumento.charAt(i).toUpperCase())
        {
            // Letras mayúsculas
             mayus++;
        }
        else if(argumento.charAt(i).toLowerCase())
        {
            // Letras minúsculas
             minus++;
        }
    }

 // Resto del código
    • 1

  3. Something like that:

    var palabra = 'PrUEbA';
var palabraArray = palabra.split('');
var upperCount = 0;
var lowerCount = 0;

palabraArray.forEach(function(element) {
  if (element == element.toUpperCase()) {
    upperCount++;
  }
  if (element == element.toLowerCase()){
    lowerCount++;
  }
});
if (upperCount > 0 && lowerCount == 0)
  alert('Todo el string esta compuesto de mayúsculas');
else if (lowerCount > 0 && upperCount == 0)
  alert('Todo el string esta compuesto de minúsculas');
else
  alert('El string esta compuesto por mayúsculas y minúsculas');

    I also did it for C#

            string palabra = "PrUeBA";
        char[] palabraArray = palabra.ToCharArray();
        int upperCount = 0;
        int lowerCount = 0;
        foreach (char letra in palabraArray)
        {
            if (char.IsUpper(letra))
                upperCount += 1;
            else
                lowerCount += 1;
        }
        if (upperCount > 0 && lowerCount == 0)
            Console.Write("Todo el string esta compuesto de mayúsculas");
        else if (lowerCount > 0 && upperCount == 0)
            Console.Write("Todo el string esta compuesto de minúsculas");
        else
            Console.Write("El string esta compuesto por mayúsculas y minúsculas");
    • 1