seed: curriculum content

1.solar-system/3.strings/01.the-message/index.md

@@ -0,0 +1,42 @@
+---
+type: challenge
+title: "The Message"
+xp: 50
+duration: 25
+difficulty: 2
+---
+
+# The Message
+
+> **[INCOMING — Mission Control, Earth]**
+>
+> Cadet, a string is a *sequence of characters*. You can pick any
+> one out by its position (its *index*).
+>
+> Indexes start at 0:
+>
+> ```
+>   M  I  S  S  I  O  N
+>   0  1  2  3  4  5  6
+> ```
+>
+> Negative indexes count back from the end. `s[-1]` is the last
+> character.
+>
+> Strings are *immutable* — you can read any character, but you can't
+> change one in place. To "modify" a string, you build a new one.
+>
+> Implement `info(s)` that returns a dict with four keys: `first`,
+> `sixth`, `last`, `length`.
+>
+> [END TRANSMISSION]
+
+## Your Task
+
+Open `starter/starter.py`. Use `s[0]`, `s[5]`, `s[-1]`, and `len(s)`
+to fill in the dict.
+
+## Objectives
+
+- `info("MISSION-CONTROL-7")` returns `{"first": "M", "sixth": "O", "last": "7", "length": 17}`
+- Works for any non-empty string of length ≥ 6