runable

lib/core/utils/extensions.dart

@@ -0,0 +1,76 @@
+extension StringExtension on String {
+  /// Capitalize first letter
+  String capitalize() {
+    if (isEmpty) return this;
+    return '${this[0].toUpperCase()}${substring(1)}';
+  }
+
+  /// Check if string is a valid number
+  bool isNumeric() {
+    return double.tryParse(this) != null;
+  }
+
+  /// Truncate string with ellipsis
+  String truncate(int maxLength, {String suffix = '...'}) {
+    if (length <= maxLength) return this;
+    return '${substring(0, maxLength)}$suffix';
+  }
+}
+
+extension DateTimeExtension on DateTime {
+  /// Check if date is today
+  bool isToday() {
+    final now = DateTime.now();
+    return year == now.year && month == now.month && day == now.day;
+  }
+
+  /// Check if date is yesterday
+  bool isYesterday() {
+    final yesterday = DateTime.now().subtract(const Duration(days: 1));
+    return year == yesterday.year && 
+           month == yesterday.month && 
+           day == yesterday.day;
+  }
+
+  /// Get relative time string (e.g., "2 hours ago")
+  String getRelativeTime() {
+    final now = DateTime.now();
+    final difference = now.difference(this);
+
+    if (difference.inSeconds < 60) {
+      return 'Just now';
+    } else if (difference.inMinutes < 60) {
+      return '${difference.inMinutes}m ago';
+    } else if (difference.inHours < 24) {
+      return '${difference.inHours}h ago';
+    } else if (difference.inDays < 7) {
+      return '${difference.inDays}d ago';
+    } else {
+      return '${(difference.inDays / 7).floor()}w ago';
+    }
+  }
+}
+
+extension DoubleExtension on double {
+  /// Round to specific decimal places
+  double roundToDecimals(int decimals) {
+    final mod = 10.0 * decimals;
+    return (this * mod).round() / mod;
+  }
+
+  /// Format as currency
+  String toCurrency({String symbol = '\$'}) {
+    return '$symbol${toStringAsFixed(2)}';
+  }
+}
+
+extension ListExtension<T> on List<T> {
+  /// Check if list is not null and not empty
+  bool get isNotEmpty => this.isNotEmpty;
+
+  /// Get first element or null
+  T? get firstOrNull => isEmpty ? null : first;
+
+  /// Get last element or null
+  T? get lastOrNull => isEmpty ? null : last;
+}