ScriptdrillParse a query string
A JavaScript exercise from Scriptdrill. Solve it with a code editor in your browser that runs your function against example and hidden tests, and it is checked the moment you submit.
The task
Parse a URL query string such as `"?page=2&tag=js&tag=web"` into an object of strings. The leading `?` is optional. `+` means a space and `%XX` escapes are decoded. A key without `=` gets `""`. Only the first `=` separates key from value. Empty pieces (as in `a=1&&b=2`) are skipped. A key that appears more than once maps to an array of its values in order.
What this exercise teaches
indexOf finds only the first =, so values may contain = signs. Replacing + before decoding matters because decodeURIComponent leaves + alone, and an encoded plus (%2B) must survive as a literal +.
A hint if you get stuck
Split on `&`, and for each piece split at the first `=` with `indexOf`. Replace `+` with a space before `decodeURIComponent`. Collect repeats into an array.
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