Dart .removeWhere()

In Dart, the .removeWhere() method removes key–value pairs from a Map when a given condition evaluates to true. The condition is provided as a function that is applied to each key and value in the map.

Syntax

map.removeWhere((key, value) => condition);

Parameters:

• key: The current key in the map.
• value: The value associated with the key.
• condition: A function that returns true for entries that should be removed.

Return value:

The .removeWhere() method returns void. The map is modified in place.

Example: Removing entries based on a condition

In this example, entries with scores below 60 are removed from the map:

void main() {
  Map<String, int> scores = {
    'Alice': 85,
    'Bob': 42,
    'Charlie': 67,
  };

  // Remove entries where the score is below 60
  scores.removeWhere((name, score) => score < 60);

  print(scores);
}

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The output of this code is:

{Alice: 85, Charlie: 67}

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