URLSearchParamsadvanced

URLSearchParams#getAll() — empty array fallback for missing keys

📖 Usage Example

const p = new URLSearchParams()
p.set('q', 'hello world')
p.toString()  // → 'q=hello+world'

URLSearchParams automatically encodes special characters in values.

URLSearchParams#getAll() — missing key fallback

params.getAll(name) always returns an array — even for keys that don't exist it returns [] (not null).

Challenge: Verify the distinction: get() returns null for missing keys, while getAll() returns [].

💡 Hints (1)

• getAll() always returns an array — use .length to check for presence instead of null checks

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