How to check if an associative array is empty in p

问题:

$a = @() 

How do I check if $a above is empty (which it is). I would like to get $true as answer.

回答1:

That's not an associative array, it's a regular array, but the answer is the same. Use .Count and compare to 0.

An associative array is called a [hashtable] in PowerShell and its literal form uses @{} (curly braces).

@{}.Count -eq 0  # hashtable (associative array)
@().Count -eq 0  # array

回答2:

Arrays have Count property, and you can check if this value is 0. So the condition you would check for is

$a.Count -eq 0