Revision history [back]

To monitor changes in a store using if statement and await, follow these steps:

1. Define the store: Create a store object with state and actions that modify the state.

2. Define a function that checks for changes in the store: This function should use an if statement to compare the previous and current state of the store.

3. Implement an event listener: Use the event listener to call the function that checks for changes in the store.

4. Use the Await keyword: Await for the changes in the store and refresh the UI.

Example:

const store = {
  state: {
    count: 0,
  },
  actions: {
    increment() {
      this.state.count++
    },
    decrement() {
      this.state.count--
    },
  },
}

function checkForChanges(prevState, currentState) {
  if (prevState.count !== currentState.count) {
    // Code to handle the changes in the store
  }
}

store.subscribe(() => {
  checkForChanges(prevState, store.state)
})

async function main() {
  while (true) {
    await store.waitFor(['increment', 'decrement'])
    // refresh UI based on changes in the store
  }
}

main()

In this example, we create a store object that has a count property in the state and two actions, increment and decrement, that modify the count property. We then define a function, checkForChanges, that checks for changes in the store and handles them accordingly. We use the store.subscribe method to listen for changes in the store and call the checkForChanges function when a change occurs. Finally, we use an async function with the await keyword to wait for changes in the store and refresh the UI when they occur.