Say you have a struct that might or might not cont...
# cfml-generald
Dave Merrill
10/10/2024, 4:22 PMSay you have a struct that might or might not contain a key you're interested in.
I've always used structKeyExists() to ask if it's there.
Is there a way to use the safe navigation operator ?. to accomplish something similar more concisely?
This avoids blowing up assigning to x, but leaves x undefined:
Copy code
s = {a:1};
x = s?.z;
writeOutput(x); Copy code
s = {a:1};
x = structKeyExists(s, "z") ? s.z : "some other value";
writeOutput(x);c
cfsimplicity
10/10/2024, 4:34 PMx = s.z?: "some other value";👍 1
i
imgunvant
10/10/2024, 4:34 PMYou may want to use Elvis Operator.
s = {a:1};
x = s.z ?: "Some Other Value";
a
aliaspooryorik
10/10/2024, 4:44 PM
Have to be a bit careful, ACF treats it as a truthy
aliaspooryorik
10/10/2024, 4:44 PM
Copy code
s = {a: false};
x = s.a ?: "Some Other Value";
writeDump( x ); // ACF returns "Some Other Value"aliaspooryorik
10/10/2024, 4:44 PM
Lucee returns 'false'
aliaspooryorik
10/10/2024, 4:45 PM
aliaspooryorik
10/10/2024, 4:46 PM
So 'Elvis has left the building' but you have no idea if he went out the backdoor, sidedoor or beamed up by aliens
simple smile 1
d
Dave Merrill
10/10/2024, 6:16 PMThanks folks, Elvis is what I was looking for, with the proviso about false-y values we've seen before an many contexts.
That behavior is actually documented, as "if [the value] is defined and not null and not a false value".
I actually meant to try that, but fluffed the syntax, thinking wrongly about what I needed to protect.
Doh!