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C0D3BREAK3R
Asked: 2022-08-25 20:38:59 +0800 CST 2022-08-25 20:38:59 +0800 CST

Problem with the toUpperCase() method

  • 772

I have the following code:

function accum(s) {
    let resultado = "";
    let cadenaAgregar = "";

    s.split("").forEach((item, i) => {
        cadenaAgregar += item.repeat(i + 1);
        cadenaAgregar[0].toUpperCase();
        resultado += cadenaAgregar;
        cadenaAgregar = "";
    });

    return resultado;
}

console.log(accum("abcd"));

Before the string is added to the 'result' variable the first letter is supposed to be converted to uppercase but this doesn't work, I'd appreciate knowing why this is happening and what I should do

javascript

1 Answers

  1. Best Answer

    Good day,

    In the line where you want to change the first letter to uppercase you don't assign it to anything

    cadenaAgregar[0].toUpperCase();

    So it's like it doesn't exist.

    You can assign the conversion to the same variable cadenaAgregar:

    cadenaAgregar = cadenaAgregar[0].toUpperCase()

    But that would remove the rest of the string, to include it you can useString.prototype.slice()

    cadenaAgregar = cadenaAgregar[0].toUpperCase() + cadenaAgregar.slice(1);

    Another option would be to use charAt()withslice()

    cadenaAgregar = cadenaAgregar.charAt(0).toUpperCase() + cadenaAgregar.slice(1);

    Full example:

    function accum(s) {
    let resultado = "";
    let cadenaAgregar = "";

    s.split("").forEach((item, i) => {
        cadenaAgregar += item.repeat(i + 1);
        cadenaAgregar = cadenaAgregar[0].toUpperCase() + cadenaAgregar.slice(1);
        resultado += cadenaAgregar;
        cadenaAgregar = "";
    });

    return resultado;
}

console.log(accum('prueba'))

    This returns:

    PRrUuuEeeeBbbbbAaaaaa
    • 2