fix: resolved comments

crates/frontend/src/logic.rs

@@ -16,7 +16,10 @@ pub enum Expression {
 }
 
 pub fn is_variable(v: &serde_json::Value) -> bool {
-    v.is_object() && v.as_object().unwrap().contains_key("var")
+    v.is_object()
+        && v.as_object()
+            .map(|v| v.contains_key("var"))
+            .unwrap_or_default()
 }
 
 pub fn is_constant(v: &serde_json::Value) -> bool {
@@ -33,7 +36,7 @@ impl Expression {
                 .cloned()
                 .ok_or("Invalid operands list for context")?;
 
-            let operand_0 = operands.first();
+            let operand_0 = operands.get(0);
             let operand_1 = operands.get(1);
             let operand_2 = operands.get(2);
 
@@ -176,6 +179,9 @@ impl From<(SchemaType, Operator)> for Expression {
     }
 }
 
+/// The `Operator` enum is just a marker to helps dynamically determine the
+/// type of input field to render and the appropriate parsing logic to
+/// apply based on the operator type.
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
 pub enum Operator {
     Is,