👉🏻 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.
Read this on my blog Hey all! Tomorrow I'm launching Composable Design Patterns — a collection of 15 patterns on how to use the composition API better. I've been working on this for a while (it's been in my head for years), and I'm excited to share it with you! You'll be getting a special launch discount, so make sure to pay attention to your email inbox tomorrow. Other than that, I've got a new podcast episode for you, and some links to check out, as well as some tips. Enjoy your week! — Michael ...
Hey! I need to clear some things up. You might be interested in learning how to write better composables, but unsure if Composable Design Patterns is right for you. If you're a beginner Vue dev, this is perfect to get you started off on the right foot — without developing bad habits or learning things the hard way. And if you've been writing Vue for a while, you'll get immediate value from this course because you'll be able to see exactly how these patterns will help you. You've experienced the pain of badly written composables (maybe even ones you wrote yourself 🙃). For those of you who are transitioning from the Options API to the Composition API (which is better for many reasons ), I specifically included the Options to Composition pattern to provide a super simple path for upgrading your app one component at a time. But this course isn't for everyone. This course is designed for professional Vue developers . If you're a student, o...
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