create basic version of array.remove

Author: EvandroLG

array.lua

@@ -76,8 +76,10 @@ array = {
 
     if array.is_empty(obj) then return {} end
 
+    local _start = start or 1
+
     local output = {}
-    for i=start, finish or #obj do
+    for i=_start, finish or #obj do
       table.insert(output, obj[i])
     end
 
@@ -443,6 +445,21 @@ array = {
       output[i] = item
     end
 
+    return output
+  end,
+
+  remove = function(obj, callback)
+    local output = {}
+    local copy = array.deep_copy(obj)
+
+    for i=1, #copy do
+      local value = copy[i]
+
+      if callback(value, i) then
+        table.insert(output, value)
+      end
+    end
+
     return output
   end
 }

test.lua

@@ -314,3 +314,14 @@ test('fill should create a table using the value passed by argument from start t
   a.equal(result[3], value)
   a.equal(result[4], value)
 end)
+
+test('remove should return a new table with all elements from table that callback returns truthy for', function(a)
+  local list = { 1, 2, 3, 4 }
+  local result = array.remove(list, function(value)
+    return math.fmod(value, 2) == 0
+  end)
+
+  a.equal(#result, 2)
+  a.equal(result[1], 2)
+  a.equal(result[2], 4)
+end)