Functional Programming with ReasonML/

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Function Scope

Function Scope

In this lesson, we'll explain the behavior of functions and their scopes.

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:

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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 ...