HashTables All Versions

Examples

• 3

  Access a hash table value by key.
  3

  An example of defining a hash table and accessing a value by the key

  $hashTable = @{
      Key1 = 'Value1'
      Key2 = 'Value2'
  }
  $hashTable.Key1
  #output
  Value1
  

  An example of accessing a key with invalid characters for a property name:

  $hashTable = @{
      'Key 1' = 'Value3'
      Key2 = 'Value4'
  }
  $hashTable.'Key 1'
  #Output
  Value3
  

  created Dec 3 '16 at 0:57

  
  discuss
• 2

  Add a key value pair to an existing hash table
  2

  An example, to add a "Key2" key with a value of "Value2" to the hash table, using the addition operator:

  $hashTable = @{
      Key1 = 'Value1'
  }
  $hashTable += @{Key2 = 'Value2'}
  $hashTable
  
  #Output
  
  Name                           Value
  ----                           -----
  Key1                           Value1
  Key2                           Value2
  

  An example, to add a "Key2" key with a value of "Value2" to the hash table using the Add method:

  $hashTable = @{
      Key1 = 'Value1'
  }
  $hashTable.Add("Key2", "Value2")
  $hashTable
  
  #Output
  
  Name                           Value
  ----                           -----
  Key1                           Value1
  Key2                           Value2
  

  edited Aug 7 at 12:59

  

  
  discuss
• 2

  Creating a Hash Table
  2

  Example of creating an empty HashTable:

  $hashTable = @{}
  

  Example of creating a HashTable with data:

  $hashTable = @{
      Name1 = 'Value'
      Name2 = 'Value'
      Name3 = 'Value3'
  }
  

  created Dec 3 '16 at 0:57

  
  discuss
• 0

  Enumerating through keys and Key-Value Pairs
  0

  Enumerating through Keys

  foreach ($key in $var1.Keys) {
      $value = $var1[$key]
      # or
      $value = $var1.$key 
  }
  

  Enumerating through Key-Value Pairs

  foreach ($keyvaluepair in $var1.GetEnumerator()) {
      $key1 = $_.Key1
      $val1 = $_.Val1
  }
  

  created Dec 26 '16 at 16:58

  
  discuss (2)
• 0

  Looping over a hash table
  0

  $hashTable = @{
      Key1 = 'Value1'
      Key2 = 'Value2'
  }
  
  foreach($key in $hashTable.Keys)
  {
      $value = $hashTable.$key
      Write-Output "$key : $value"
  }
  #Output
  Key1 : Value1
  Key2 : Value2
  

  created Dec 3 '16 at 0:57

  
  discuss
• 0

  Remove a key value pair from an existing hash table
  0

  An example, to remove a "Key2" key with a value of "Value2" from the hash table, using the remove operator:

  $hashTable = @{
      Key1 = 'Value1'
      Key2 = 'Value2'
  }
  $hashTable.Remove("Key2", "Value2")
  $hashTable
  
  #Output
  
  Name                           Value
  ----                           -----
  Key1                           Value1
  

  created Aug 8 at 13:06

  
  discuss