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Conditional operators: if, '?'#231
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Original file line number | Diff line number | Diff line change |
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@@ -1,12 +1,11 @@ | ||
**Sí lo hará.** | ||
Cualquier stringexcepto uno vacío (y `"0"`que no es vacío) se convierte en`true`en un contexto lógico. | ||
Podemos ejecutar y verificar: | ||
```js run | ||
if ("0") { | ||
alert( 'Hola' ); | ||
} | ||
``` | ||
Original file line number | Diff line number | Diff line change |
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@@ -2,13 +2,12 @@ importance: 5 | ||
--- | ||
# if (un stringcon cero) | ||
Se mostrará el`alert`? | ||
```js | ||
if ("0") { | ||
alert( 'Hello' ); | ||
} | ||
``` | ||
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---|---|---|---|---|---|---|
@@ -2,13 +2,12 @@ importance: 2 | ||||||
--- | ||||||
#El nombre de JavaScript | ||||||
Usando el constructor`if..else`, escribe el código que pregunta: '¿Cuál es el nombre "oficial" de JavaScript?' | ||||||
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| ||||||
Si el visitador escribe "ECMAScript",Entonces muestras "¡Correcto!",de lo contrario--muestra: "¿No lo sabes? ¡ECMAScript!" | ||||||
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| ||||||
 | ||||||
[demo src="ifelse_task2"] | ||||||
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@@ -6,7 +6,7 @@ | ||
<script> | ||
'use strict'; | ||
let value = prompt('Escribe un número', 0); | ||
if (value > 0) { | ||
alert(1); | ||
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@@ -1,7 +1,7 @@ | ||
```js run | ||
let value = prompt('Escribe un número', 0); | ||
if (value > 0) { | ||
alert( 1 ); | ||
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@@ -4,12 +4,12 @@ importance: 2 | ||||||
# Show the sign | ||||||
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| ||||||
Usando el constructor`if..else`,escribe un código que obtenga através de un`prompt`un número y entonces muestre en un `alert`: | ||||||
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| ||||||
- `1`,si el valor es mayor que cero, | ||||||
- `-1`,si es menor que cero, | ||||||
- `0`,si es igual a cero. | ||||||
En la tarea asumimos que siempre el usuario introduce un número. | ||||||
[demo src="if_sign"] |
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@@ -1,6 +1,6 @@ | ||
```js | ||
result = (a + b < 4) ? 'Debajo' : 'Encima'; | ||
``` | ||
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@@ -1,9 +1,9 @@ | ||
```js | ||
let message = (login == 'Empleado') ? 'Hola' : | ||
(login == 'Director') ? 'Felicidades' : | ||
(login == '') ? 'Sin sesión' : | ||
''; | ||
``` | ||
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@@ -2,21 +2,21 @@ importance: 5 | ||||||
--- | ||||||
#Reescriba el'if..else'con '?' | ||||||
Reescriba el`if..else`utilizando operadores ternarios múltiples`'?'`. | ||||||
Para legibilidad, es recomendad dividirlo en múltiples lineas de código. | ||||||
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| ||||||
```js | ||||||
let message; | ||||||
if (login == 'Empleado') { | ||||||
message = 'Hola'; | ||||||
} else if (login == 'Director') { | ||||||
message = 'Felicidades'; | ||||||
} else if (login == '') { | ||||||
message = 'Sin sesión'; | ||||||
} else { | ||||||
message = ''; | ||||||
} | ||||||
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