What is the best way to clear out all entries in a Dictionary?

I have some code that will overwrite on an as-needed basis for MANY dictionary entries. Is this the correct way to go about this if I want to make sure all memory is released for the entries:

--Script

local module = require(script.ModuleScript)
local done = module.Add()
local myTable = module.Table()

function removeTable()
	for i, v in pairs(myTable) do
		print(i,v)
	end
	myTable = module.Table(true)
	print("---table removed checking---")
	for i, v in pairs(myTable) do
		print(i,v)
	end
	print("---table checking done ---")
end

removeTable()

done = module.Add()
for i,v in pairs (myTable) do
	print(i,v)
end

. .

--Module Script

local module = {}
local theTable = {}

function module.Add()
	local counter = 0
	local temp = ""
	while counter < 3 do
		counter = counter + 1
		temp = tostring(counter)
		theTable[temp] = true
	end
	return (theTable)
end

function module.Table(valueIn)
	if valueIn == true then
		theTable = {}
	end
	return (theTable)
end

return module

--[[   Output
	
1 true
3 true
2 true
---table removed checking---
---table checking done ---
1 true
3 true
2 true
--]]

It looks like it works how I want it to, but I'm still learning and I really don't want to deal with a problem later on.

What you are doing is creating a new table when you run module.Table(true) this means that anything held within the last table can be used.

Example

local tblModule = require(script.ModuleScript)

local tbl1 = tblModule.Table()
local tbl2 = tblModule.Table(true)
print(tbl1 == tbl2) -- false

This can cause a lot of problems if two scripts use this same module they could end up with different tables being used.

The valid method of clearing a index is to set its value to nil tbl1["2"] = nil. So your clear function should loop through the table and set the key to nil.

function module.Table(valueIn)
    if valueIn == true then
        for i, _ in pairs(theTable) do
			theTable[i] = nil
		end
    end
    return theTable -- parentheses are not needed here
end

The second problem is with your Add function as running it again will have 0 effect on the table as the counter is not stored. You should also use a numeric for loop as well.

local counter = 0
local addAmount = 3
local theTable = {}

function module.Add()
	for i=1,   addAmount do
		theTable[tostring(counter +i)] = true
	end

	counter = counter  + addAmount 
end

You would also need to reset the counter when you clear the table.

Hope this helps.