Web Development with ReasonML

Using Variables and Doing Arithmetic in ReasonML

Now that you know your way around compiling and running a program, let’s create a program that uses variables and performs calculations. Specifically, we’ll write a program that calculates a total price, given a quantity and per-unit price. From this point on, we’ll be using examples from the code samples accompanying this book, downloadable from the Pragmatic Programmers website.

first-project/src/TotalPrice.re

let qty = 7;
let price = 15;
let total = qty * price;
Js.log2("The total price is $", total);

This code introduces variables. Variable names in ReasonML, like those in many other programming languages, must begin with a lowercase letter and may be followed ...