1. Problem
You want to measure the numeric (minimum, maximum, sum, average) or textual (characters, words, lines) features of a list of objects.
2. Solution
Use the Measure-Object cmdlet to measure these statistical properties of a list.
To measure the numeric features of a stream of objects, pipe those objects to the Measure-Object cmdlet:
        PS >1..10 | Measure-Object–Average -Sum
        [...]

1. Problem
You have an object and want to add your own custom properties or methods (members) to that object.
2. Solution
Use the Add-Member cmdlet to add custom members to an object.
3. Discussion
The Add-Member cmdlet is extremely useful in helping you add custom members to individual objects. For example, imagine that you want to create a report [...]

1. Problem
You have an item (for example, an error record, directory item, or .NET object), and you want to display detailed information about that object in a list format.
2. Solution
To display detailed information about an item, pass that item to the Format-List cmdlet. For example, to display an error in list format, type the commands:
        [...]