Object arrays in PowerShell - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an object array in PowerShell?

An object array in PowerShell is a collection that holds multiple objects, allowing you to store and manage several items together in one variable.

beginner

How do you create an empty object array in PowerShell?

You create an empty object array by assigning an empty array literal: $array = @().

beginner

How can you add an object to an existing array in PowerShell?

You can add an object by using the += operator, like $array += $newObject. This appends the new object to the array.

intermediate

What is the difference between an array and an object array in PowerShell?

An array can hold any type of data, but an object array specifically holds objects, which can have properties and methods, making them more versatile.

beginner

How do you access the properties of objects inside an object array?

You access properties by indexing the array and then using dot notation, for example: $array[0].PropertyName.

How do you initialize an empty object array in PowerShell?

A $array = {}

B $array = @()

C $array = []

D $array = ()

In PowerShell, @() creates an empty array. Curly braces {} are for script blocks, square brackets [] are for type literals, and parentheses () are for grouping.

Which operator adds an object to an existing array in PowerShell?

A /=

B -=

C *=

D +=

The += operator appends an item to an array in PowerShell.

How do you access the first object's property named 'Name' in an object array called $arr?

A $arr[0].Name

B $arr.Name[0]

C $arr->Name[0]

D $arr[Name].0

Use index first, then dot notation: $arr[0].Name.

What type of elements can an object array hold in PowerShell?

A Any objects including custom objects

B Only numbers

C Only integers

D Only strings

Object arrays can hold any objects, including custom objects with properties.

What happens if you add an object to an array using += in PowerShell?

A The array is cleared

B The object replaces the array

C The object is appended to the array

D An error occurs

Using += appends the new object to the existing array.

Explain how to create and add objects to an object array in PowerShell.

Think about starting empty and then adding items one by one.

Describe how to access properties of objects stored inside an object array.

Remember arrays use numbers to pick items, objects use names for properties.