Shutdown event is a system to set some functions to be ran in end of program.
For example:
# this function will be ran in the end of program
func the_end
println('The end')
endfunc
# register this function to shutdown event
register_shutdown(the_end)
println('hello')
println('world')
output:
hello
world
the end
In the above example, we used register_shutdown function to set function the_end as shutdown event. this function will be ran in the end of program.
Also you can set more than 1 function:
func end1
println('first end')
endfunc
func end2
println('second end')
endfunc
register_shutdown(end1)
register_shutdown(end2)
output:
first end
second end