On 2015-07-22 3:35 PM, John Colvin wrote:
On Wednesday, 22 July 2015 at 21:36:58 UTC, jmh530 wrote:
On Wednesday, 22 July 2015 at 20:43:04 UTC, simendsjo wrote:
When "everything" is an expressions, you can write things like
auto a = if(e) c else d;
In D you have to write
type a = invalid_value;
if(e) a = c;
else a = d;
assert(a != invalid_value);
I prefer this example from one of the various Rust tutorials
let foo = if x == 5 {
"five"
}
else if x == 6 {
"six"
}
else {
"neither"
}
You're basically using a conditional expression as an rvalue. You can
do the same thing with a { } block.
Admittedly nowhere near as clean, but if you can bear to see the
"return"s, function literals can turn any bunch of code in to an
expression:
auto foo = { if(x == 5)
return "five";
else if(x == 6)
return "six";
else
return "neither";
}();
or of course there's the perhaps overly terse (brackets optional, i like
them to visually group the condition with the ? ):
auto foo = (x == 5)? "five"
: (x == 6)? "six"
: "neither";
Shouldn't that be its own function anyway? If you needed it in one
place, you'll probably need it elsewhere. And, in this case, it can
even be marked as pure.
