Powershell 3 Cmdlets Hackerrank Solution [LATEST]
If no employee has >=2 years experience, Where-Object outputs $null, and the rest of the pipeline should fail gracefully. HackerRank expects:
# Add defensive check
$data = Import-Csv .\employees.csv | Where-Object $_.YearsOfExperience -ge 2
if (-not $data) Write-Host "No eligible employees"; exit
# then continue...
But if they disallow if, use Select-Object with -Skip trickery or rely on Format-Table to output nothing.
ProcessName CPU Id
----------- --- --
chrome 45.23 1234
powershell 12.78 5678
explorer 11.02 9101
Filters objects based on a condition.
$data | Where-Object $_.YearsOfExperience -ge 2
Problem: Given two arrays a and b of 3 integers each, compare corresponding elements. Award 1 point to a if a[i] > b[i], 1 point to b if b[i] > a[i]. Return [aliceScore, bobScore].
$n, $arr = @($input)[0,1] # dangerous if lines >2
Better robust reading:
$lines = @($input)
$n = [int]$lines[0]
$arr = $lines[1].Trim() -split '\s+' | ForEach-Object [int]$_
| Mistake | Why It Fails | Fix |
|---------|--------------|-----|
| Using Sort-Object on strings | "105000" < "85000" lexically | Convert to [int] first |
| Using ForEach-Object to sum | HackerRank penalizes explicit loops | Use Measure-Object -Average |
| Forgetting -First on Select-Object | Returns all sorted items | Add -First 3 |
| Not using calculated properties | Can't compute average per group | Use @N="...";E=... |
| Outputting raw objects instead of table | HackerRank compares exact string output | Use Format-Table -AutoSize |
You are given a list of running processes.
Write a PowerShell script that: powershell 3 cmdlets hackerrank solution
The provided PowerShell function is well-structured and readable. It uses a switch statement to handle different cmdlets, which makes the code concise and easy to maintain.
The function also includes input validation and provides meaningful error messages. If no employee has >=2 years experience, Where-Object
However, there are a few areas that can be improved: