How to use data from local storage

local-storage.js

// Instead of converting string to boolean
const isRetention = localStorage.getItem('is_retention') === 'true';
// Parsing the  JSON is better solution
const isRetention = JSON.parse(localStorage.getItem('is_retention'));
// Or create a helper function to parse the item
const getLocalStorageItem = item => JSON.parse(localStorage.getItem(item));
const isRetention = getLocalStorageItem('is_retention');