Callum Macpherson

@Callumm

Software Developer

LondonJoined September 2022

About

Backend developer with strong experience in the .NET ecosystem and AWS. Other development skills include JavaScript/React/Vue, HTML, CSS.

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Callum Macpherson's blogs

Callum Macphersonblog.thecallum.com6 posts

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Recently published

CMCallum Macphersonblog.thecallum.comAug 20, 2023 · 2 min read

How to use the React.useDebugValue hook

According to the React docs: useDebugValue is a React Hook that lets you add a label to a custom Hook in React DevTools. When do I need useDebugValue? useDebugValue becomes important when you implement a custom hook. For example, let's say you have...

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CMCallum Macphersonblog.thecallum.comAug 20, 2023 · 2 min read

How to use React.useRef hook

According to the React docs: useRef is a React Hook that lets you reference a value that’s not needed for rendering. Here are two examples where useRef should be used: Referencing a value with a ref Manipulating the DOM with a ref Referencing a...

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CMCallum Macphersonblog.thecallum.comAug 19, 2023 · 2 min read

Why do you need the key prop when rendering lists?

Have you ever wondered why the key prop is so required when rendering lists in React? In this article, I will break down why you need to pass the prop, and what might happen when you don't. Rendering data from arrays Here is an example that I have pl...

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CMCallum Macphersonblog.thecallum.comOct 8, 2022 · 14 min read

Authenticate your web app using AWS Cognito

In this article, you will find out how to integrate AWS Cognito into NextJs and understand the different authentication types that Cognito supports. I had a use case where I wanted to integrate Cognito into a web app. For reasons I will explain later...

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CMCallum Macphersonblog.thecallum.comSep 23, 2022 · 8 min read

Getting Started with Cypress in React - E2E Testing

By the end of this article, you will know how to start writing your own Cypress tests. My aim is to give you the minimum amount of information to get started. I believe the best way to learn is to get started as quickly as possible. When you get stuc...

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Callum Macpherson

About

Available for

Callum Macpherson's blogs

Recently published

How to use the React.useDebugValue hook

How to use React.useRef hook

Why do you need the key prop when rendering lists?

Authenticate your web app using AWS Cognito

Getting Started with Cypress in React - E2E Testing

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Callum Macpherson

About

Available for

Callum Macpherson's blogs

Recently published

How to use the React.useDebugValue hook

How to use React.useRef hook

Why do you need the key prop when rendering lists?

Authenticate your web app using AWS Cognito

Getting Started with Cypress in React - E2E Testing