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1. Chapter 4
Arrays
And
Hashtables

2. What is an
Array ?

3. What is an Array ?
-An array is a systematic arrangement o
objects, usually in rows and columns.
collection of data items that can be sele
by indices computed at run-time,

4. Create an Array or
List of Items

5. to create an array that holds a given set of items,
separate those items with commas:

6. To create an array of a specific size, use the New-Object cmdlet:

7. To store the output of a command that generates a list, use variable
assignment:

8. To create an array that You plan to modify frequently, use an ArrayList,
as shown

9. Create a Jagged or
Multidimensional
Array

10. To create an array of arrays (a jagged array), use the @() array syntax:

11. Access Elements
of an Array
Access Elements of an Array

12. To access a specific element of an array, use PowerShell's array access mechanism:

13. To access a range of array elements, use array ranges and array slicing:

14. Visit Each
Element of
an
Array

15. To access each item in an array one-by-one, use the Foreach-Object cmdlet:

16. To access each item in an array in a more script like fashion, use the foreach
scripting keyword:

17. Sort an Array
or List of Item

18. To sort a list of items, use the Sort-Object cmdlet:

19. To sort by your own logic, use a script block as the sort expression. In
this example, sorting by the second character:

20. If you want to sort a list that you've saved in a variable, you can either store the
results back in that variable, or use the [Array]::Sort() method from the .NET
Framework:

21. Determine
Whether an Array
Contains an Item

22. To determine whether a list contains a specific item, use the –contains
operator:

23. Combine Two Arrays

24. To combine PowerShell arrays, use the addition operator (+):

25. One common reason to combine two arrays is when you want to add data to the end
of one of the arrays.

26. Find Items in an Arra
That Match a Value

27. nd all elements that match an item, use the –eq, -like, and –match comparison operators:

28. more complex comparison conditions, the Where-Object cmdlet lets you find elements
ist that satisfy much more complex conditions:

29. Compare Two List

30. To compare two lists, use the Compare-Object cmdlet:

31. Remove Elements
from an Array

32. Removing elements from an array using the–ne, -notlike, and–notmatch operators

33. To actually remove the items from the array, store the results back in the array:

34. Create a Hashtable
or Associative
Array

35. What are
Hash
Tables?

38. To define a mapping between labels and items, use a hashtable (associative array):

41. Magnetic Drum
Group 8
Paul Stephen Gonzaga
A magnetic drum differs fromPillos
Christian a
magnetic disk in that the tracks in
Eliezer Quirong
which the data is stored are assigned to
channels located around the
Renedrum, The tracks
Tumaneng
circumference of the
Adrian Panganibam
on each channel are grouped
into sectors , Some drums are mounted
Giselle Tangpuz
in a horizontal position, such as the
one shown, while others are mounted
in a vertical position. As all illustrated
in the figure.