LESSON 627 OF 679 · PROJECTS: COMMAND-LINE TOOLS

CLI Tool: sort v1 — Ascending Alphabetical Sort

Practice

Build a tiny version of the Unix sort command. Given a list of lines, return them sorted in ascending order by character code (like LC_ALL=C sort: uppercase letters come before lowercase ones, "Zebra" before "apple", and an empty line comes first), joined by newline characters (\n). Duplicates are all kept. If the list is empty, return the empty string.

Function signature:

fn sort_lines(lines: Vec<String>) -> String

Example:

Input: lines = ["banana", "apple", "cherry"]

Output: "apple\nbanana\ncherry"

When printed:
apple
banana
cherry

You already own the input vector, so bind it as mutable, sort it with sort(), then combine the lines with the slice join("\n") method.

The full solution:

impl Solution {
    fn sort_lines(lines: Vec<String>) -> String {
        let mut sorted_lines = lines;
        sorted_lines.sort();
        return sorted_lines.join("\n");
    }
}

STEP 1 OF 3

Guided

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