Strings Solution - Intro to Computer ScienceYouTube↗  IA↗(long shot)
Education  19.4K views 22 likes 6 dislikes   02 Mar 2012
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[Peter] The correct answer for this
La respuesta correcta es
is all of them but the second choice.
todas menos la segunda.
Let's see why.
Veamos por qué,
Let's pick an example, string s.
Pensemos en una cadena s de ejemplo.
Let's say s is duck.
Digamos que s es "duck" (pato).
In the first example, we concatenate a with s,
En el primer ejemplo, concatenamos a con s,
so taking one onwards is going to give us back duck,
así que, si tomamos desde la posición 1 en adelante nos devuelve "duck"
which is our original string s.
que es igual a nuestra cadena inicial s.
This works. For the second choice, let's just plug in duck.
Funciona. Para la segunda opción, escribamos "duck" otra vez.
The first character, the zeroth character in duck
La primera letra, el carácter 0 en la cadena "duck"
is going to be d, and we're going to concatenate that
va a ser la letra d, y la vamos a concatenar
with the rest of the string, giving us back our original string duck.
con el resto de la cadena, el resultado es igual a nuestra cadena original "duck".
So this seems like it works, but we have to remember that s
Y al parecer funciona, pero tenemos que recordar que s
can be the empty string.
puede ser una cadena vacía.
If we try taking the character at position 0,
Si intentamos tomar el carácter de la posición 0,
we would get an error because there is no character at position 0
nos va devolver un error porque no existe un carácter en la posición 0
because there are no characters in s.
ya que s no contiene ningún carácter.
Moving on, if we try adding an empty string
Continuemos, si tratamos de añadir una cadena vacia
onto s, we get exactly what we had before because we're not adding anything.
a s, obtenemos el mismo resultado que teníamos porque en realidad no estamos añadiendo nada.
For the last choice, it doesn't seem completely obvious
Para la última opción, no parece ser que
that it works for the empty string.
funcione con la cadena vacía.
It seems unintuitive that taking every character from position 0 onward
Parece poco intuitivo que al tomar todas las letras desde la posición 0 en adelante
would not result in an error because there are no characters.
no vaya a resultar en error, ya que no contiene caracteres,
Well, we have to remember that for the subsequence operator,
Bueno, tenemos que recordar que para el operador de subsecuencias,
this does not cause an error.
esto no dispara un error.
Why is that the case? Because.
¿Y se preguntarán por qué? Porque sí.
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