Powershell and the Left Hand Side
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A new article, to talk about an important notion in Powershell, the Left Hand Side (LHS) notion.
When using operators in Powershell, the type of the object to the left of the operator (LHS) defines the type of the object to the right (RHS: Right Hand Side).
Only elements of the same type can be compared, added, multiplied, etc.
If the type is different between LHS and RHS then Powershell tries to convert the RHS object to the same type as the LHS object, if it can’t, it throws an exception
The expected result is 9 is smaller than 10 but the result is 9 is equal to or greater than 10.
If we check the type of variables
In the previous example, Powershell converts 10 into a string and compares 9 to 1, and 9 is much greater than 1.
Another example with the multiplication operator, an integer and a string
One last example with the multiplication operator, an array and a string where the result will be different depending on the element in LHS
This is also why comparisons with $null must be placed on the left. To find out more about using $null, you can read Kevin Marquette’s (https://powershellexplained.com) article published on the Microsoft site.
https://learn.microsoft.com/en-us/powershell/scripting/learn/deep-dives/everything-about-null#checking-for-null
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