Parse a query string in JavaScript
JavaScript interview exercise on Practical, difficulty 2 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
Write parseQuery(str) that turns "page=2&q=core%20platform&flag" into { page: "2", q: "core platform", flag: "" }. Values are decoded; a key without = gets "". An empty string returns {}.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.