Same signature as v2, but now n may be larger than the number of lines. If n > len(lines) 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:
func head(lines []string, n int) string
Example:
Input: lines = ["alpha", "beta", "gamma"], n = 10 Output: "alpha\nbeta\ngamma" When printed: alpha beta gamma
Slicing
lines[:n] past the end panics in Go, so clamp n with min(n, len(lines)) before slicing. strings.Join then stitches the prefix together with newlines.
end := min(n, len(lines))
return strings.Join(lines[:end], "\n")
The full solution:
func head(lines []string, n int) string {
end := min(n, len(lines))
return strings.Join(lines[:end], "\n")
}
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