public String getStringArgsResult() {
        return this.stringArgsResult;
    }
Reference implementation for String concatenation step, a mid-traversal step which concatenates one or more
String values together to the incoming String traverser. If the incoming traverser is a non-String value then an
{@code IllegalArgumentException} will be thrown.

@author Yang Xia (http://github.com/xiazcy)
gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/ConcatStep.java