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learnings/dart-digit-separators.md

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+# Dart Supports Underscore Digit Separators
+
+In Dart (starting from version 3.6.0), you can use underscores (`_`) as digit separators in number literals to make them more readable. This is especially handy for large numbers or when grouping digits for higher-level clarity.
+
+Here are some examples:
+
+```dart
+var n1 = 1_000_000;
+var n2 = 0.000_000_000_01;
+var n3 = 0x00_14_22_01_23_45;  // MAC address
+var n4 = 65_1234_5678;  // SG Phone number
+var n5 = 100__000_000__000_000;  // one hundred million million!
+```
+
+This feature makes it easier to read long numeric values and organize digits meaningfully.
+
+Dart isn’t alone in supporting this - other languages like JavaScript, Java, Python, and Kotlin also allow underscore digit separators. It's a great example of a feature that crosses language boundaries to make code cleaner and more human-readable.