How should I practice Implement tail -n?

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Problem · String

Implement tail -n

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● Easy

ConfluentFULLTIMEOA

Problem statement

You are given a string fileContents that represents the contents of a text file. Lines are separated by newline characters .

Return the last n lines of the file in their original order. If the file has fewer than n lines, return the entire contents. If n = 0, return an empty string.

Function

tailLastNLines(n: int, fileContents: String) → String[]

Complete the function tailLastNLines in the editor below.

tailLastNLines has the following parameters:

int n: the number of trailing lines to keep
String fileContents: the full file contents

Returns

String[]: the last n lines in order, without adding extra formatting.

Examples

Example 1

n = 2fileContents = "a\nb\nc\n"return = ["b", "c"]

The last two lines are b and c.

Example 2

n = 0fileContents = "a\nb\nc"return = []

Keeping zero trailing lines returns an empty array.

Constraints

0 <= n
fileContents may be large, so an efficient solution should avoid unnecessary copies.