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GraphQL operations are broken up into 2 types: queries and mutations. Queries are read-only, mutations modify data. Here's what you need to know about mutations in Apollo.
Apollo is a GraphQL server - it parses your GraphQL schema and provides a framework for you to define resolvers and mutations. Here's what you need to know.
The `v-for` directive lets you render a separate item for each element in an array. Here's what you need to know.
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Unit testing is tricky, especially on the frontend. Here's a couple of patterns we use at Mastering JS for testing Vue components in isolation.
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Vue instances have a `$refs` property that lets you access a Vue instance's child components. Here's what you need to know.
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Puppeteer is a great tool for testing JavaScript apps in a real browser. Here's what you need to know.
State machines may seem like a dull abstract topic, but they are extremely useful for JavaScript developers. Here's what you need to know.
Async/await lets you write async code in a way that looks sync. No callbacks or promise chains, just `for` loops and `if` statements. Here's what you need to know.
When you call `new Promise` in JavaScript, you invoke the Promise constructor. Here's how you can use the Promise constructor like a pro.
Resolving a promise in JavaScript is how you mark a promise as fulfilled. Here's what you need to know.
The `Promise.all()` function lets you execute multiple promises in parallel, and accumulates the results. Here's what you need to know.
A webhook is an API endpoint designed to be called by an outside service when an event occurs. Here's what you need to know about webhooks in Express.
Server-sent events are an alternative to websockets for pushing events from your Express server to your client. Here's how you can get started with server-sent events in Node.js with Express.
The switch statement is like a multi-tiered `if` statement that can execute different code for different cases. This tutorial shows you how to use the `switch` and `case` statements.
The `vue.config.js` file configures the Vue CLI. Here's what you need to know.
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Vue components have lifecycle hooks just like React components. Vue calls these functions whenever it does certain things to your component.
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Learn how to set classes on an element conditionally in Vue.js.
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The `this` keyword, also known as a function's "context" or "scope", is a powerful but confusing concept. Here's how you can wrap your head around it.
Whether you should use `==` or `===` is a common cause of confusion in JavaScript. The TLDR is that you should use `===`, with one minor exception. Here's what you need to know.
You can get tomorrow's date using vanilla JavaScript, although it is often easier with a library like Moment.js. Here's what you need to know.