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Let’s look at using composition instead of classical inheritance in JavaScript.
JavaScript is an expressive language and is one reason I enjoy using it. An interesting feature is the ability to compose objects from simple objects without inheritance.
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Have you ever written a unit test and it seems to take a long time to make green?
What is a long time, you might ask? In my opinion if you spend more than 5 minutes solving the test you wrote then you are in the amber zone that you made it too complex. If greater than 10 minutes then you need to simplify the test. Which might not seem like an obvious thing to do.
This exercise is to help unblock the solving of complex tests consistently and quicker.
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In this post I will discuss why and how to use higher-order components (HOC) with React JS.
Why use HOC: Promote reuse of logic across React components.
Components are the typical element for reuse in React but sometimes features don’t fit into this standard. There might be similar methods used to fetch data but maybe the display is different. An example of this is shown later.
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As with any new tech it can be overwhelming and confusing how all the parts work together. Especially with the combo of Relay and GraphQL. Hopefully this post will help demystify some things in Relay.
What is Relay: Data driven JavaScript framework used to efficiently handle data communication between a React and a GraphQL server.
Why use it: One typical issue found in an SPA are the number of network calls made to render a page. Quickly this starts to affect your server performance because the requests made can be high. Relay is focused around efficient network calls helping to mitigate this issue. Another good feature is the queries are close to the components making it obvious the data requirements.
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What is should-enzyme: An library of extension functions for ShouldJS and a wrapper round Enzyme.
Why use it: Make it easier to test ReactJS components, improve readability of asserts and provide better error messaging on failing tests.
Should-Enzyme API in the read me on Github and is an NPM package.
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The Singleton pattern is to ensure there is only one instance of the class that exists. In the case it does exist it returns a reference to that object. This is normally achieved by a method belonging to the class to create an instance.
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What is Joinable: A library to join strings together without the need to check if a value is a falsy like undefined.
Why use it: Keep your code base clean by removing the if else statements and improve the readability.
Joinable API in the read me on Github and is an NPM package.
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Below is a succinct overview of what is continuous integration, delivery and deployment. The core benefit of following these practices allows developers to ship production code quicker to the user. This should help provide a quicker feedback loop.
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Eye drops is an Elixir mix task used to watch file changes and run tasks in the command line for those files. You can read more about how to use it on my Github repository read me documentation.
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Redux has reducers tasked with transforming the state across the application. They are pure functions, which is a function that does not modify variables outside of its scope or depend on them. They are given the same parameters and the output should be the same every time.
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I’ve moved away from using a Git GUI to command line, I typically used GitExtensions. The reason being, it’s a little slow having to open any GUI to make a commit and push. It is quicker to use the command line and a side benefit you learn more about how Git works.
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To follow on from the testing post I wrote on Findmypast tech blog for stubbing dependances in commonJS using proxyquire.
