use-memo.md

useMemo

Adds one new behavior to your Stimulus controller : memo

This behavior can be used to cache ("memoize") expensive getter methods, for example when parsing attributes passed in via the Stimulus Data API. All you need to do is to add a static array of getter method names memos, as you would define your targets. Then call useMemo(this) in your connect() callback and your getters are memoized.

Reference

useMemo(controller)

controller : a Stimulus Controller (usually 'this')

Usage

Composing

import { Controller } from 'stimulus'
import { useMemo } from 'stimulus-use'

export default class extends Controller {
  static memos = ['normalizedText']
  static targets = ['longText']

  connect() {
    useMemo(this)

    this.normalizedText // first call normalize the text and cache the result
    this.normalizedText // second call gets the result from the cache
  }

  get normalizedText() {
    return this.longTextTarget.textContent.normalize('NFD')
  }
}