diff --git a/utils/lib.js b/utils/lib.js
index 11c63cb..969bb95 100644
--- a/utils/lib.js
+++ b/utils/lib.js
@@ -7,7 +7,7 @@ function compare(a, b, operator) {
     let logMsg = '';
     let returnValue = undefined;
     try {
-        logMsg = 'Quantity comparison of ' + a + ', ' + b + ' with operator ' + operator;
+        logMsg = `Quantity comparison of ${a}, ${b} with operator ${operator}`;
         switch (operator)  {
             case '==':
                 returnValue = a.equal(b);
@@ -29,7 +29,7 @@ function compare(a, b, operator) {
                 break;
         }
     } catch(e) {
-        logMsg = 'Standard comparison of ' + a + ', ' + b + ' with operator ' + operator;
+        logMsg = `Standard comparison of ${a}, ${b} with operator ${operator}`;
         switch (operator) {
             case '==':
                 returnValue = (a == b);
@@ -53,7 +53,7 @@ function compare(a, b, operator) {
     }
 
     if (returnValue == undefined) {
-        console.error('No valid operator provided');
+        console.error(`${operator} is no valid operator`);
     } else {
         console.debug(logMsg);
     }