initial commit

.gitignore

@@ -0,0 +1,2 @@
+.envrc
+*.nix

stack.tl

@@ -0,0 +1,36 @@
+local record Stack
+	contents: {any}
+	top: number
+end
+function Stack:push(val: any)
+	self.top = self.top + 1
+	table.insert(self.contents,val)
+end
+function Stack:pop(): any
+	self.top = self.top -1
+	if self.top < 0 then
+		error("Stack underflow")
+	end
+	return table.remove(self.contents)
+end
+local stack_mt = {__index = Stack}
+function Stack:new(): Stack
+	return setmetatable({contents = {}, top = 0} as Stack, stack_mt)
+end
+
+
+-- operations
+function add(stack: Stack)
+	local a: any =stack:pop()
+	local b: any=stack:pop()
+	if a is number and b is number then
+		local c=a+b
+		stack:push(c)
+	else
+		error("invalid operands for add operation!")
+	end
+end
+function dot(stack: Stack)
+	print(stack:pop())
+end
+