Defer & Errdefer

• defer and errdefer run in LIFO order, each kind being part of the same one queue.
• If there are several defer statements, and one fails, further defer statements will still attempt to run.
• Rad's error code will become an error if the main script succeeded but a defer statement failed.
• errdefers will not get triggered if the main script succeeded but a defer or errdefer statement failed.

defer

defer Example

defer:
    print(1)
    print(2)
defer:
    print(3)
    print(4)
print("Hello!")

defer Example Output

Hello!
3
4
1
2

errdefer

errdefer Example 1

defer:
    print(1)
    print(2)
errdefer:
    print(3)
    print(4)
defer:
    print(5)
    print(6)
errdefer:
    print(7)
    print(8)
print("Hello!")
exit(0)  // successful script run

errdefer Example 1 Output

Hello!
5
6
1
2

errdefer Example 2

defer:
    print(1)
    print(2)
errdefer:
    print(3)
    print(4)
defer:
    print(5)
    print(6)
errdefer:
    print(7)
    print(8)
print("Hello!")
exit(1)  // perceived as error!

errdefer Example 2 Output

Hello!
7
8
5
6
3
4
1
2