feat(radio-group): add compareWith property (#28452)

core/src/utils/forms/compare-with-utils.ts

@@ -0,0 +1,44 @@
+type CompareFn = (currentValue: any, compareValue: any) => boolean;
+
+/**
+ * Uses the compareWith param to compare two values to determine if they are equal.
+ *
+ * @param currentValue The current value of the control.
+ * @param compareValue The value to compare against.
+ * @param compareWith The function or property name to use to compare values.
+ */
+export const compareOptions = (
+  currentValue: any,
+  compareValue: any,
+  compareWith?: string | CompareFn | null
+): boolean => {
+  if (typeof compareWith === 'function') {
+    return compareWith(currentValue, compareValue);
+  } else if (typeof compareWith === 'string') {
+    return currentValue[compareWith] === compareValue[compareWith];
+  } else {
+    return Array.isArray(compareValue) ? compareValue.includes(currentValue) : currentValue === compareValue;
+  }
+};
+
+/**
+ * Compares a value against the current value(s) to determine if it is selected.
+ *
+ * @param currentValue The current value of the control.
+ * @param compareValue The value to compare against.
+ * @param compareWith The function or property name to use to compare values.
+ */
+export const isOptionSelected = (
+  currentValue: any[] | any,
+  compareValue: any,
+  compareWith?: string | CompareFn | null
+) => {
+  if (currentValue === undefined) {
+    return false;
+  }
+  if (Array.isArray(currentValue)) {
+    return currentValue.some((val) => compareOptions(val, compareValue, compareWith));
+  } else {
+    return compareOptions(currentValue, compareValue, compareWith);
+  }
+};

core/src/utils/forms/index.ts

@@ -1,2 +1,3 @@
 export * from './form-controller';
 export * from './notch-controller';
+export * from './compare-with-utils';