persistence: boolean/string conversion

1 files changed, 9 insertions, 0 deletions

diff --git a/acf2/util.lua b/acf2/util.lua
index 25e885b..a40f7fd 100644
--- a/acf2/util.lua
+++ b/acf2/util.lua
@@ -71,6 +71,15 @@ function M.keys(tbl)
    return res
 end
 
+--- determine whether a value is present in an array.
+-- @param list an array
+-- @param value a value
+-- @return a boolean
+function M.contains(list, value)
+   for k, v in ipairs(list) do if v == value then return true end end
+   return false
+end
+
 --- map a function over a table.
 -- @param func a function with one argument
 -- @param tbl the table