How to make each key equal to its value in an array?

local aTable = {}
local aString = "JustAString"

aTable[aString] = true

The key is "JustAstring" and the value is true. After you set the value, these two are exactly the same way to point to the position in the table:

local aTable = {}
local aString = "JustAString"

aTable[aString] = true
print(aTable[aString])
--prints true
print(aTable.JustAString)
--prints true

It's important to know you can only do this with string keys, so use an objects.Name if you wish to store object references in the table.

And to show that it is indeed adding different records:

local aTable = {}
local aString = "JustAString"
aTable[aString] = true
aString = "ADifferentString"
aTable[aString] = 25
print(aTable.JustAString)
print(aTable[aString])
--prints: true, then 25
--The Table now has two records in it, the first with a value of true, and the second with a value of 25