👉🏻 This "Quick Start with Pinia" lesson on Pinia breaks down this powerful Vue state management library, showing you how to efficiently manage data across components.
👉🏻 This library is written using Vue 3 with Composition API, and the components are designed and written in a traditional Vue way possible, with full TypeScript support.
👉🏻 Lightweight and framework independent but offers Vue 2/3, Alpine.js and Svelte integrations.
🔥 Vue Tip: Avoid Side Effects in Computed Properties
It is considered bad practice to introduce side effects inside computed properties and functions because it makes the code unpredictable and hard to understand.
What is a side effect? In the context of computed properties, a side effect is a modification of the state's global state or the internal component state.
Let's take a look at an example with side effects:
1<script setup lang="ts">2import { computed, ref } from 'vue'34const firstName = ref('Michael')5const lastName = ref('Hoffmann')6const array = ref([])78const fullName = computed(() => {9 firstName.value = 'Mike' // side effect10 return `${firstName.value} ${lastName.value}`11})1213const reversedArray = computed(() => array.value.reverse()) // side effect, original array is mutated14</script>
Now let's change the code and remove the side effects:
1<script setup lang="ts">2import { computed, ref } from 'vue'34const firstName = ref('Michael')5const lastName = ref('Hoffmann')6const array = ref([])78const fullName = computed(() => `${firstName.value} ${lastName.value}`)9const reversedArray = computed(() => array.value.slice(0).reverse()) // .slice creates a copy of the array10</script>
Now the code is predictable and easy to understand. The computed properties fullNamefullName and reversedArrayreversedArray only depend on the values of firstNamefirstName, lastNamelastName, and arrayarray. They don't modify the global state or the internal component state.
If you're using Vue 3, you're probably using composables. But other than using VueUse where you can, how do you get the most out of them? Over the past few years I've been slowly putting together a list of patterns and best practices for how to write composables in the best way. I've spent hours reading the source code of VueUse (one of the best — but most time-consuming — ways to learn it). I've read articles, listened to talks, and written lots and lots of my own code. I ended up with 15 different patterns, and each one will help you to write better composables. I've condensed and put all of these composables together into a course — Composable Design Patterns. Get Composable Design Patterns now. Because this is the launch, it's on sale for 35% off until Thursday. For each of the 15 patterns in this course, you'll get: A concise overview that tells you when and how to use it, along with variations and edge cases ...
Weekly Vue News #194 Reactive Time Ago View online Hi 👋 I'm on vacation this week, so no special news from my side — just some fresh Vue & Nuxt content for you! Enjoy this issue and have a lovely week ☀️ Vue 📕 Optimizing heavy operations in Vue with Web Worke...
Read this on my blog We made it to 200! Thanks for reading and supporting me over the last few years, it means a lot to me. Tomorrow is the last day of the Composable Design Patterns course launch and the 35% off discount. If you were hoping to pick it up, don't forget to check it out! As always, I've got some tips and links for you, and a new podcast episode. Enjoy, and have a great week! — Michael 🔥 Default Content with Slots You can provide fallback content for a slot, in case no content is provided: < !-- Child.vue --> < template > < div > < slot > Hey! You forgot to put something in the slot! < / slot > < / div > < / template > This content can be anything, even a whole complex component that provides default behaviour: < !-- Child.vue --> < template > < div > < slot name = "search" > < !-- Can...
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