A simple mathematical example.
We are given a simple polynomial such as:
f(x) = x² + 3x + 4
What is the value of f(x) when x = 3?
We compute this by substituting the value of 3 for x in the expression.
If we do that, we have the result:
f(3) = 3² + 3(3) + 4 = 22
Now, we are using Lisp
define a function like this:
(defun fx (x)
(+ (expt x 2) (* 3 x) 4))
Finally, we call the function:
(fx 3)
22
You can execute the code in your browser
Here: https://jscl-project.github.io/