Mastering JS@mastering_js

Bite sized JavaScript tutorials for busy developers Follow us on Substack: masteringjs.substack.com

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masteringjs.io
Joined May 2021
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Convert a set to an array for calculating intersection with another set 😎 Learn more about converting a set to an array 👉 masteringjs.io/tutorials/fun… #JavaScript #CodeNewbie
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🆕 Convert a Set to an Array in JavaScript: masteringjs.io/tutorials/fun… #JavaScript #CodeNewbie
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🆕 What Does Setting the Length of a JavaScript Array Do? masteringjs.io/tutorials/fun… #JavaScript #CodeNewbie
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Sort an object's keys in alphabetical order 🆒 Learn more about sorting by properties in JavaScript 👉 masteringjs.io/tutorials/fun… #JavaScript #CodeNewbie
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Node's built-in `assert()` takes a 2nd param that lets you specify the error message that Node will throw if the first param is falsy This is handy for user-friendly error messages without if statements More about assert in Node 👉 masteringjs.io/tutorials/nod… #NodeJS #CodeNewbie
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Love our tutorials? Sign up for our weekly newsletter and never miss a tutorial! getrevue.co/profile/masterin…
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`Array(30).fill(null)` makes it easy to create an array of 30 objects (or any number you want) as a one-liner More about mapping arrays in JavaScript 👉 masteringjs.io/tutorials/lod… #JavaScript #CodeNewbie
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🆕 Make a Horizontal Bar Chart with ChartJS masteringjs.io/tutorials/cha… #CodeNewbie #JavaScript
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ObjectRouter: define an Express router based on object structure. Optional transform for changing API names from camel case to kebab case 😎 More about Express routers 👉 masteringjs.io/tutorials/exp… #NodeJS #100DaysOfCode
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You don't need state management in Vue 3 1️⃣ Provide/inject solve prop drilling 2️⃣ Vue rendering doesn't prop diff, so minimal perf benefit to mapping state We find ourselves just doing `Vue.provide(state)` and calling it a day masteringjs.io/tutorials/vue… #VueJS #CodeNewbie
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TIL putting a `p` tag in an `a` tag is invalid HTML 🧐 So thankful for 12 year old SO questions: stackoverflow.com/questions/… #CodeNewbie #100DaysOfCode
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Love our tutorials? Sign up for our weekly newsletter and never miss a tutorial! getrevue.co/profile/masterin…
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Use `filter()` and `reduce()` to strip out all keys that don't start with "param-" from an object. Request headers, in this case. More about filtering an object by key in JavaScript 👉 masteringjs.io/tutorials/fun… #JavaScript #CodeNewbie
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Vue computed properties can be helpful for accessing component-specific constants in your templates Learn more about computed properties 👉 masteringjs.io/tutorials/vue… #VueJS #CodeNewbie #JavaScript
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Add a session header to every Axios request using Axios interceptors 🆒 More about interceptors 👉 masteringjs.io/tutorials/axi… #JavaScript #CodeNewbie
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Love our tutorials? Sign up for our weekly newsletter and never miss a tutorial! getrevue.co/profile/masterin…
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We love modals in Vue, but sometimes we also need a vanilla JS modal. Here's how. Same CSS, etc. as here 👉 masteringjs.io/tutorials/vue… just slightly different JS #JavaScript #CodeNewbie
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🆕 Get the Last Element in an Array in JavaScript: masteringjs.io/tutorials/fun… #JavaScript #CodeNewbie
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Mastering JS retweeted
Mastering JS@mastering_js
11 Jan 2023
We love this pattern: a `/api/status` endpoint that displays 1️⃣ Current package.json version 2️⃣ Current environment Makes it easy to double check what's in prod, and make sure you're not talking to prod Check out our ExpressJS tutorials 👉 masteringjs.io/express #NodeJS
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The Mastering JS website is 100% open source. Check it out on GitHub, and please star our repo! github.com/mastering-js/mast…
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