Rewrite the function using '?' or '||'
importance: 4
The following function returns true
if the parameter age
is greater than 18
.
Otherwise it asks for a confirmation and returns its result.
function
checkAge
(
age
)
{
if
(
age >
18
)
{
return
true
;
}
else
{
return
confirm
(
'Did parents allow you?'
)
;
}
}
Rewrite it, to perform the same, but without if
, in a single line.
Make two variants of checkAge
:
- Using a question mark operator
?
- Using OR
||
Using a question mark operator '?'
:
function
checkAge
(
age
)
{
return
(
age >
18
)
?
true
:
confirm
(
'Did parents allow you?'
)
;
}
Using OR ||
(the shortest variant):
function
checkAge
(
age
)
{
return
(
age >
18
)
||
confirm
(
'Did parents allow you?'
)
;
}
Note that the parentheses around age > 18
are not required here. They exist for better readability.