/TypeScript/How to update objects in locall storage

How to update objects in locall storage

// Get the existing data
var existing = localStorage.getItem('myFavoriteSandwich');

// If no existing data, create an array
// Otherwise, convert the localStorage string to an array
existing = existing ? existing.split(',') : [];

// Add new data to localStorage Array
existing.push('tuna');

// Save back to localStorage
localStorage.setItem('myFavoriteSandwich', existing.toString());

Source: gomakethings.com

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