core/util: add table_values() helper function

radio/core/util.lua

@@ -33,6 +33,21 @@ local function table_keys(table)
     return keys
 end
 
+---
+-- Get the values of a table.
+--
+-- @internal
+-- @function table_values
+-- @tparam table table Table
+-- @treturn array values of table
+local function table_values(table)
+    local values = {}
+    for _, v in pairs(table) do
+        values[#values + 1] = v
+    end
+    return values
+end
+
 ---
 -- Make a shallow clone of a table.
 --
@@ -296,4 +311,4 @@ local function format_options(options)
     return table.concat(lines, "\n")
 end
 
-return {table_length = table_length, table_keys = table_keys, table_copy = table_copy, table_extend = table_extend, array_concat = array_concat, array_flatten = array_flatten, array_map = array_map, array_exists = array_exists, array_search = array_search, array_all = array_all, array_equals = array_equals, array_find = array_find, parse_args = parse_args, format_options = format_options}
+return {table_length = table_length, table_keys = table_keys, table_values = table_values, table_copy = table_copy, table_extend = table_extend, array_concat = array_concat, array_flatten = array_flatten, array_map = array_map, array_exists = array_exists, array_search = array_search, array_all = array_all, array_equals = array_equals, array_find = array_find, parse_args = parse_args, format_options = format_options}

tests/core/util_spec.lua

@@ -19,6 +19,18 @@ describe("table and array utilities", function ()
         assert.is.same(keys, {"a", "b", "c"})
     end)
 
+    it("table_values()", function ()
+        assert.is.same(util.table_values({}), {})
+
+        local values = util.table_values({[4] = "abc", [5] = "def", [6] = "ghi"})
+        table.sort(values)
+        assert.is.same(values, {"abc", "def", "ghi"})
+
+        local values = util.table_values({a = 4, b = 5, c = 6})
+        table.sort(values)
+        assert.is.same(values, {4, 5, 6})
+    end)
+
     it("table_copy()", function ()
         local x = {foo = 'bar', bar = nil, abc = true, def = 1}
         local y = util.table_copy(x)