Prefijos y Sufijos

Clase 13 de 33 • Curso de Programación en Swift (2019)

Clase anteriorSiguiente clase

José Javier Cueto Mejía

student•

.hasPrefix() 👉🏽Si empieza con un cadena

.hasSuffix() 👉🏽si finaliza con una cadena

David Barreto

student•

Interesante esto del prefijo y sufijo, son funciones que seguramente en un futuro serviran de algo.

Edgardo Marcano

student•

Asi es.

Edgar Benjamin Tzul Tacam

student•

José Ocando

student•

let collection = [
    "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all", "\"Swift\", One language to rule them all",
]
var rings = 0
for ring in collection{
        if ring.hasPrefix("\"Swift\""){
        rings += 1
    }
}
print("We created \(rings) rings")```

Carlos Valdes

student•

let avion = ["Fila 1 Columna 1", "Fila 1 Columna 2", "Fila 1 Columna 3", "Fila 1 Columna 4", "Fila 1 Columna 5",
             "Fila 2 Columna 1", "Fila 2 Columna 2", "Fila 2 Columna 3", "Fila 2 Columna 4",
             "Fila 3 Columna 1", "Fila 3 Columna 2", "Fila 3 Columna 3"]
var cantidad = 0
for indice in avion {
    if indice.hasPrefix("Fila 2"){
        cantidad += 1
    }
}
print("El avion tiene \(cantidad) Columnas en la Fila 2")

Lilia Andrea Ruiz Coronel

student•

😃

Josias Pérez

student•

let aCollection = [
    "Gema del alma",
    "Gema del espacio",
    "Gema del tiempo",
    "Gema del realidad",
    "Gema del poder",
    "Gema del mente"
]

var gemPowersCount = 0
for gema in aCollection{
    if gema.hasPrefix("Gema"){
        gemPowersCount += 1
    }
}

let thanos = ("\"Finally I got all \(gemPowersCount) gems in my possession\" -Thanos")

print(thanos)
```**let** aCollection = \[

"Gema del alma",

"Gema del espacio",

"Gema del tiempo",

"Gema del realidad",

"Gema del poder",

"Gema del mente"

]



**var** gemPowersCount = 0

**for** gema **in** aCollection{

**if** gema.hasPrefix("Gema"){

gemPowersCount += 1

}

}



**let** thanos = ("\\"Finally I got all \\(gemPowersCount) gems in my possession\\" -Thanos")



print(thanos)

Jonathan Meixueiro

student•

He hecho el ejemplo del acto recortando de un elemento de la colección el string "Act 1"... practicada, probablemente 0 pero sirvió para reforzar

let act1 = collectionScenes[0]
let rangeAct = act1.index(act1.endIndex, offsetBy: -8)..<act1.endIndex
var act1String = String(act1)
act1String.removeSubrange(rangeAct)

print("\nThe number of scenes of \(act1String) is: \(act1SceneCount)")

Giovanny Zdenco Jukopila Rueda

student•

<code> 
let family = ["Giovanny Jukopila","Yango Jukopila", "Nubia Rueda", "John Jukopila"]
var hasSurname = 0
for surname in family{
    if surname.hasSuffix("Jukopila"){
        hasSurname += 1
    }
}
print ("somos \(hasSurname) Jukopilas en la familia")

Álvaro Felipe García Méndez

student•

Una variante podría ser

var ac1SceneCount = 0
for scene in collection {
//    if scene.hasPrefix("Act 1") {
//        ac1SceneCount += 1
//    }
    ac1SceneCount += scene.hasPrefix("Act 1") ? 1: 0
}

print("Number of scenes for act 1 are: \(ac1SceneCount)")

Peter Jonathan Montalvo Garcia

student•

let greeting = "Hello world"
greeting.hasPrefix("Hello")
greeting.hasSuffix("world")
greeting.hasSuffix("english")