refactor: add centralize avatar initials in DisplayUtils

components/MintAvatar.tsx

@@ -2,7 +2,7 @@ import * as React from 'react';
 import { Image, Text, View } from 'react-native';
 
 import { themeColor } from '../utils/ThemeUtils';
-import { getMintAvatarInitials } from '../utils/CashuUtils';
+import { getAvatarInitials } from '../utils/DisplayUtils';
 
 import Ecash from '../assets/images/SVG/Ecash.svg';
 
@@ -30,7 +30,7 @@ const MintAvatar: React.FC<MintAvatarProps> = ({
     const dims = SIZES[size];
 
     if (showPlaceholder) {
-        const initials = getMintAvatarInitials(name || undefined);
+        const initials = getAvatarInitials(name || undefined);
         return (
             <View
                 style={[

models/Contact.ts

@@ -2,6 +2,7 @@ import { computed } from 'mobx';
 import BaseModel from './BaseModel';
 import RNFS from 'react-native-fs';
 
+import { getAvatarInitials } from '../utils/DisplayUtils';
 import { getPhoto } from '../utils/PhotoUtils';
 
 export default class Contact extends BaseModel {
@@ -184,12 +185,6 @@ export default class Contact extends BaseModel {
     }
 
     @computed public get getAvatarInitials(): string {
-        const name = (this.name || '').trim();
-        if (!name) return '';
-        const words = name.split(/\s+/).filter(Boolean);
-        const firstInitial = words[0][0] || '';
-        const lastInitial =
-            words.length > 1 ? words[words.length - 1][0] || '' : '';
-        return (firstInitial + lastInitial).toUpperCase();
+        return getAvatarInitials(this.name);
     }
 }

utils/CashuUtils.ts

@@ -90,14 +90,5 @@ class CashuUtils {
     };
 }
 
-export const getMintAvatarInitials = (name: string | undefined): string => {
-    const n = (name || '').trim();
-    if (!n) return '';
-    const words = n.split(/\s+/).filter(Boolean);
-    const first = words[0][0] || '';
-    const last = words.length > 1 ? words[words.length - 1][0] || '' : '';
-    return (first + last).toUpperCase();
-};
-
 const cashuUtils = new CashuUtils();
 export default cashuUtils;

utils/DisplayUtils.test.ts

@@ -0,0 +1,44 @@
+import { getAvatarInitials } from './DisplayUtils';
+
+describe('DisplayUtils', () => {
+    describe('getAvatarInitials', () => {
+        it('returns empty string for undefined', () => {
+            expect(getAvatarInitials(undefined)).toBe('');
+        });
+
+        it('returns empty string for empty string', () => {
+            expect(getAvatarInitials('')).toBe('');
+        });
+
+        it('returns empty string for whitespace-only string', () => {
+            expect(getAvatarInitials('   ')).toBe('');
+        });
+
+        it('returns single initial for one word', () => {
+            expect(getAvatarInitials('John')).toBe('J');
+            expect(getAvatarInitials('Kaloudis')).toBe('K');
+        });
+
+        it('returns two initials for two words', () => {
+            expect(getAvatarInitials('Evan Kaloudis')).toBe('EK');
+            expect(getAvatarInitials('John Doe')).toBe('JD');
+        });
+
+        it('returns first and last initial for three or more words', () => {
+            expect(getAvatarInitials('John Quincy Adams')).toBe('JA');
+            expect(getAvatarInitials('Mary Jane Watson Parker')).toBe('MP');
+        });
+
+        it('trims leading and trailing whitespace', () => {
+            expect(getAvatarInitials('  Evan Kaloudis  ')).toBe('EK');
+        });
+
+        it('handles multiple spaces between words', () => {
+            expect(getAvatarInitials('John   Doe')).toBe('JD');
+        });
+
+        it('returns uppercase initials', () => {
+            expect(getAvatarInitials('john doe')).toBe('JD');
+        });
+    });
+});

utils/DisplayUtils.ts

@@ -0,0 +1,13 @@
+/**
+ * Returns avatar initials from a name string.
+ * Uses first letter of first word and first letter of last word.
+ * Examples: "Alice Bob" -> "AB", "John Quincy Adams" -> "JA", "John" -> "J"
+ */
+export const getAvatarInitials = (name: string | undefined): string => {
+    const n = (name || '').trim();
+    if (!n) return '';
+    const words = n.split(/\s+/).filter(Boolean);
+    const first = words[0][0] || '';
+    const last = words.length > 1 ? words[words.length - 1][0] || '' : '';
+    return (first + last).toUpperCase();
+};