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Functional Programming with ReasonML

Function Scope

Explore how function scope works in ReasonML, including the lifecycle of variables inside functions, let bindings, and interaction with global variables. Understand how immutability affects higher-scope values and how ReasonML manages multiple function definitions, preparing you for advanced concepts like recursion and currying.

We'll cover the following...

Inside the Function Body

In Reason, data created inside the body of a function will not exist outside it. Only the value we return is accessible. For example, this code will produce an error:

Reason
let a = 10;
let b = 5;
let product = (a, b) => {
  let c = 20;
  a * b * c;
};
/* Accesing c outside the function */
c;

Redefining a Function

Because of let bindings, we can use the same identifier to define different functions. The latest definition will be ...