Truly declarative language?

Question

Does anyone know of a truly declarative language? The behavior I\'m looking for is kind of what Excel does, where I can define variables and formulas, and have the formula\'s re

Answer 1

Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio

x = 10
y = 20
z = function() return x + y; end
x = 50
= z()
70