var_d = as.Date("12.03.18", "%d.%m.%y")
var_f = factor(c("yes", "no"))
var_c = c("yes", "no")
var_n = 1:10
var_l = as.logical(c("true", "false"))
variable_type(var_d)
variable_type(var_f)
variable_type(var_c)
variable_type(var_n)
variable_type(var_l)
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