String condition to bool-CodePudding

I am busy trying to create an if statement on the front end from the back end string value

The image above is from the back end and I replaced the $blody1$ with

so in the end it will be something like this [Guest].length > 1

Is there a way to convert it to a true or false, if not any pointers to help. I wanted to move the logic to the back end but belive I will have the same issue there aswell.

Side note the end result should be like {"color" : "blue"} OR {"color" : "orange"}

MY CODE

const start = "\$";
const end = "\$";

final startIndex = str.indexOf(start);
final endIndex = str.indexOf(end, startIndex   start.length);

String tValue =
    str.substring(startIndex   start.length, endIndex);
String tcondition = str.substring(endIndex   1);
print(getValue(tValue).toString()   tcondition);

Thank you

CodePudding user response：

you can check like below code

void main() {
   var data = {"body1":["Guest"]};
  
  print(data["body1"][0]=="Guest");//true
}

Update

Check the body length

Color color = Colors.green;
 if(data["body1"].length>1){
   // set your color
   color = Colors.red;
 }