Compare client storage.
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01
Understand the problem
storage
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02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
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03
03
Study the solution
The solution is waiting
Give it an honest attempt first — then compare your thinking with the full walkthrough.
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04
Read the code
Each store's API + cookie flags
// localStorage — persists across sessions (strings only)
localStorage.setItem("theme", "dark");
console.log(localStorage.getItem("theme")); // "dark"
localStorage.setItem("user", JSON.stringify({ id: 1 })); // objects → JSON
// sessionStorage — same API, gone when the tab closes
sessionStorage.setItem("wizardStep", "2");
// cookie — small, sent with every request; secure it with flags
document.cookie = "token=abc; Max-Age=3600; Secure; SameSite=Lax";
// (HttpOnly cookies are set by the SERVER and are invisible to JS)05
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