ReasonML Quick Start Guide

Writing to localStorage

Let's now add the functionality to create and update customers. To do this, we'll need to convert our Reason data structure to JSON. In the interface file, DataPureReason.rei, we'll expose a toJson function:

/* DataPureReason.rei */let parse: string => array(CustomerType.t);let toJson: array(CustomerType.t) => string;

And then we'll implement it:

/* DataPureReason.re */let customerToJson = (customer: CustomerType.t) => {  let id = customer.id;  let name = customer.name;  let street = customer.address.street;  let city = customer.address.city;  let state = customer.address.state;  let zip = customer.address.zip;  let phone = customer.phone;  let email = customer.email;  {j|    {      "id": $id,      "name": "$name",      "address": { "street": ...