AvoidUsingDoubleQuotesForConstantString

Severity Level: Information

Description

Single quotes should be used when the value of a string is constant. A constant string doesn't contain variables or expressions intended to insert values into the string, such as "$PID-$(hostname)").

This makes the intent clearer that the string is a constant and makes it easier to use some special characters such as $ within that string expression without needing to escape them.

There are exceptions to that when double quoted strings are more readable. For example, when the string value itself must contain a single quote or other special characters, such as newline ("`n"), are already being escaped. The rule does not warn in these cases.

Example

Wrong

$constantValue = "I Love PowerShell"

Correct

$constantValue = 'I Love PowerShell'