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List Rendering (v-for)

Master the v-for directive and understand why the :key attribute is absolutely critical for performance.

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v-for

List rendering.

Quick Quiz //

Why is it dangerous to use the array `index` as the `:key` in a v-for loop?

011. Iterating over Arrays

EXECUTIVE_SUMMARY // AEO_OPTIMIZED

[Answer Engine Overview: What, Why & How]

We can use the `v-for` directive to render a list of items based on an array. The directive requires a special syntax in the form of `item in items`, where `items` is the source data array.

We can use the v-for directive to render a list of items based on an array. The directive requires a special syntax in the form of item in items, where items is the source data array.

022. The Importance of Keys

When Vue is updating a list of elements rendered with v-for, by default it uses an 'in-place patch' strategy. If the order of the data items has changed, Vue will patch each element in-place. To give Vue a hint so it can track each node's identity, you must provide a unique :key attribute.

033. Iterating over Objects

You can also use v-for to iterate through the properties of an object. The syntax is (value, key, index) in myObject.

?Frequently Asked Questions

Can I use v-if and v-for on the same element?

It's highly discouraged. `v-if` has a higher priority than `v-for`, meaning the `v-if` condition won't have access to variables from the `v-for` scope. Instead, wrap the element in a `<template v-for>` and put the `v-if` on the inner element.