Extracting Characters from Harness Variable Expressions
You can return the character at a specified index in a Harness variable expression string.
This can be helpful with built-in variable expressions such as ${artifact.buildNo}, ${artifact.revision}, or Service and Workflow variables you have created that contain version numbers or other important strings.
To return characters, you can use the charAt() method with your variable expression.
Step 1: Use the charAt() Method
Let's look at an example where you have a variable named ${version}. that evaluates to 1234.
To get the first character of the string, you would use ${${version}.charAt(0)}. This would return 1.
The ${version} references the variable, and the rest of the expression evaluates the string using the charAt() method.