Table of Contents
What do you need to know about Hashtables in PowerShell?
Generally, you think of a hashtable as a key/value pair, where you provide one key and get one value. PowerShell allows you to provide an array of keys to get multiple values. In this example, I use the same lookup hashtable from above and provide three different array styles to get the matches.
How to create arrays and hash tables in PowerShell?
The Read a CSV File and Build Distinguished Names on the Fly by Using PowerShell post was really cool, and it presented a practical way to use arrays. The last post was Easily Create and Manipulate an Array of Arrays in PowerShell, and I discussed working with an array of arrays. Today, I want to look at creating an array that contains hash tables.
How is a hashtable different from an array?
Because a hashtable is a collection of key/value pairs, you iterate over it differently than you do for an array or a normal list of items. The first thing to notice is that if you pipe your hashtable, the pipe treats it like one object. Even though the .count property tells you how many values it contains.
How can I get multiple keys in PowerShell?
PowerShell allows you to provide an array of keys to get multiple values. In this example, I use the same lookup hashtable from above and provide three different array styles to get the matches.
What is PowerShell hash table?
A PowerShell hash table is data structure of key/value pairs. A key/value pair is essentially a set of two elements that are related in some manner. In its simplest form, a hash table is just a way to store one or more sets of item names and item values.
Does PowerShell have associative arrays?
An associative array is a compact data structure for storing a collection of keys and values where each key is paired with a value. PowerShell uses the hash table data type for storing the contents of an associative array because this data structure provides a fast lookup mechanism.
What is a hashtable key?
The hashtable key is the method of accessing a specific piece of information from a hashtable. Typically a hashtable is a table full of keys value pairs. With this technique each value has a corresponding hashtable key. This type of table can be used in many functional areas of computer processing.
What is hash table?
Hash table. In computing, a hash table (hash map) is a data structure that implements an associative array abstract data type, a structure that can map keys to values.