PowerShell - Functions
You want to create a function that accepts pipeline input and outputs the square of each number. Which of the following function definitions correctly implements this?
You want to create a function that accepts pipeline input and outputs the square of each number. Which of the following function definitions correctly implements this?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Identify pipeline input by value
function Square-Number { param([Parameter(ValueFromPipeline=$true)]$Number) process { Write-Output ($Number * $Number) } } usesValueFromPipeline=$true, enabling pipeline input by value.Step 2: Check output logic
The process block outputs the square of each input number correctly.Step 3: Analyze other options
function Square-Number { param($Number) begin { Write-Output ($Number * $Number) } } lacks pipeline input attribute. function Square-Number { param([Parameter(ValueFromPipelineByPropertyName=$true)]$Number) process { Write-Output ($Number * $Number) } } uses pipeline input by property name, which requires objects with matching property names. function Square-Number { param([Parameter(ValueFromPipeline=$false)]$Number) process { Write-Output ($Number * $Number) } } disables pipeline input.Final Answer:
function Square-Number { param([Parameter(ValueFromPipeline=$true)]$Number) process { Write-Output ($Number * $Number) } } -> Option BQuick Check:
ValueFromPipeline=$true with process block = correct pipeline input [OK]
Quick Trick: Use ValueFromPipeline=$true and process block for pipeline input functions [OK]
Common Mistakes:
- Using ValueFromPipelineByPropertyName when input is simple values
- Placing logic in begin block instead of process
- Setting ValueFromPipeline to $false
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