Why does case_when have two different outputs here?-CodePudding

I am failing to understand why the output is different when I use two different cases of case_when:

Option 1:

x = 5
y = print("goodmorning")
z = print("goodafternoon")
q = print("goodevening")
case_when(x > 3 ~ y, x < 8 ~ z)

Output 1:

[1] "goodmorning"

Option 2:

x = 5
case_when(x > 3 ~ print("goodmoring"), x < 8 ~ print("goodafternoon"))

Output 2:

[1] "goodmoring"
[1] "goodafternoon"
[1] "goodmoring"

Can someone enlighten me how this results in two completely different outputs. I believed that case_when sequentially and that it jumps out of the case_case when the first time the a condition is met and this seems to hold for the first piece of code, but why does it not hold for the second code?

CodePudding user response：

Citing the help page (emphasis mine),

case_when() evaluates all RHS expressions, and then constructs its result by extracting the selected (via the LHS expressions) parts