You want a PowerShell function Calculate-Sum that adds two numbers, but if the second number is not provided, it should default to the first number. Which parameter default setup achieves this?

hard📝 Application Q15 of 15

PowerShell - Functions

You want a PowerShell function Calculate-Sum that adds two numbers, but if the second number is not provided, it should default to the first number. Which parameter default setup achieves this?

Aparam([int]$a, [int]$b = 0)

Bparam([int]$a = 0, [int]$b = 0)

Cparam([int]$a, [int]$b = $null)

Dparam([int]$a, [int]$b = $a)

Step-by-Step Solution

Solution:

Step 1: Understand PowerShell parameter default evaluation
PowerShell binds earlier parameters before evaluating defaults for later ones, allowing references to prior parameters.
Step 2: Identify the correct setup
param([int]$a, [int]$b = $a) sets $b to the value of $a when $b is not provided.
Final Answer:
param([int]$a, [int]$b = $a) -> Option D
Quick Check:
Later defaults can reference earlier parameters [OK]

Quick Trick: Later parameters can default using earlier parameter values [OK]

Common Mistakes:

Using fixed defaults like 0 or $null
Thinking parameter references are not allowed in defaults
Assuming defaults must be literal constants

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You want a PowerShell function Calculate-Sum that adds two numbers, but if the second number is not provided, it should default to the first number. Which parameter default setup achieves this?

Step 1: Understand PowerShell parameter default evaluation

Step 2: Identify the correct setup

Final Answer:

Quick Check:

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