February 2019
Beginner to intermediate
180 pages
4h 4m
English
Content preview from ReasonML Quick Start Guide
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Reflecting
In this chapter, we learned the basics of setting up bs-jest with both the CommonJS and ES Module formats. We also learned that unit testing can help force us to write better code because, for the most part, code that is easier to test is also better. We refactored getCustomer to getCustomerById, and moved the array of customers into that component's state.
Since we've written our unit tests in Reason, the compiler checks our tests as well. For example, if Customer_test.re uses getCustomer and we change getCustomerById to getCustomer in Customer.re, we get a compile time error:
We've found a bug for you!/__tests__/Customers_test.re 45:9-2843 |];44 let customer: CustomerType.t =45 Customer.getCustomer(customers, 2) |> Belt.Option.getExn; ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.