LESSON 378 OF 413 · PROJECTS: COMMAND-LINE TOOLS

CLI Tool: head v3 — Cap n at lines.Count in C#

Practice

Same signature as v2, but now n may be larger than the number of lines. If n > lines.Count simply return all the lines (don't crash, don't pad). For this version assume n ≥ 0. If n is 0, or there are no lines, the result is the empty string.

Function signature:

string Head(List<string> lines, int n)

Example:

Input: lines = ["alpha", "beta", "gamma"], n = 10

Output: "alpha\nbeta\ngamma"

When printed:
alpha
beta
gamma

lines.GetRange(0, n) with n > lines.Count throws. So clamp n with Math.Min(n, lines.Count) first.

int end = Math.Min(n, lines.Count);
return string.Join("\n", lines.GetRange(0, end));

The full solution:

class Solution {
    public string Head(List<string> lines, int n) {
        int end = Math.Min(n, lines.Count);
        return string.Join("\n", lines.GetRange(0, end));
    }
}

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CLI Tool: head v3 — Cap n at lines.Count in C#

Head V3 in C#