javascript beginner 2026-11-17 结束

Parse a query string

Write parseQuery(qs) that turns a URL query string into an object, without URLSearchParams.

  • A leading ? is optional: "?page=2&q=flask" gives { page: "2", q: "flask" }.
  • Values are URL-decoded, and + means a space.
  • A key that appears more than once gives an array of values, in order.
  • A key without = gets an empty string.

Acceptance criteria

  • An empty string gives {}.
  • The tests at the bottom print All tests passed.

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