Refactor/display input part 2 (#1555)

* Email - Money - Number

* Date

front/src/utils/cast-as-integer-or-null.ts

@@ -1,19 +1,29 @@
+const DEBUG_MODE = false;
+
 export function canBeCastAsIntegerOrNull(
   probableNumberOrNull: string | undefined | number | null,
 ): probableNumberOrNull is number | null {
   if (probableNumberOrNull === undefined) {
+    if (DEBUG_MODE) console.log('probableNumberOrNull === undefined');
+
     return false;
   }
 
   if (typeof probableNumberOrNull === 'number') {
+    if (DEBUG_MODE) console.log('typeof probableNumberOrNull === "number"');
+
     return Number.isInteger(probableNumberOrNull);
   }
 
   if (probableNumberOrNull === null) {
+    if (DEBUG_MODE) console.log('probableNumberOrNull === null');
+
     return true;
   }
 
   if (probableNumberOrNull === '') {
+    if (DEBUG_MODE) console.log('probableNumberOrNull === ""');
+
     return true;
   }
 
@@ -21,9 +31,13 @@ export function canBeCastAsIntegerOrNull(
     const stringAsNumber = +probableNumberOrNull;
 
     if (isNaN(stringAsNumber)) {
+      if (DEBUG_MODE) console.log('isNaN(stringAsNumber)');
+
       return false;
     }
     if (Number.isInteger(stringAsNumber)) {
+      if (DEBUG_MODE) console.log('Number.isInteger(stringAsNumber)');
+
       return true;
     }
   }