Is there a way to put conditionals in functions?

Is there a way to make something conditional in a function? For example

setblock 5 10 5 air
tellraw @a {"rawtext":[{"text":"Placed!"}]} # <--- Make this command conditional (only runs if the setblock worked)
give @p diamond_helmet # <-- this runs anyway

I know how to do certain things conditionally such as running a command if a creeper is there:

execute @e[type=creeper,c=1] ~~~ execute @p ~~~ say Hi!

but for things other than single entity detection I don’t know how to approach this.

setblock 5 10 5 air
execute @p 5 10 5 detect ~ ~ ~ air -1 tellraw @a {"rawtext":[{"text":"Placed!"}]}
give @p diamond_helmet