Dart Map.fromIterables()
Syntax & Examples

Syntax of Map.fromIterables

The syntax of Map.Map.fromIterables constructor is:

Map.fromIterables(Iterable<K> keys, Iterable<V> values)

This Map.fromIterables constructor of Map creates a map associating the given keys to the given values.

Parameters

ParameterOptional/RequiredDescription
keysrequiredAn iterable representing the keys to be associated with the values.
valuesrequiredAn iterable representing the values to be associated with the keys.

✐ Examples

1 Create a map from string-int pairs

In this example,

  1. We create an iterable of keys containing strings 'a', 'b', 'c' and an iterable of values containing integers 1, 2, 3.
  2. We then create a map using Map.fromIterables() with the provided keys and values iterables.
  3. The resulting map associates the keys with their corresponding values.
  4. We print the map to standard output.

Dart Program

void main() {
  var keys = ['a', 'b', 'c'];
  var values = [1, 2, 3];
  var map = Map.fromIterables(keys, values);
  print('Map from iterables: $map');
}

Output

Map from iterables: {a: 1, b: 2, c: 3}

2 Create a map from int-string pairs

In this example,

  1. We create an iterable of keys containing integers 1, 2, 3 and an iterable of values containing strings 'one', 'two', 'three'.
  2. We then create a map using Map.fromIterables() with the provided keys and values iterables.
  3. The resulting map associates the keys with their corresponding values.
  4. We print the map to standard output.

Dart Program

void main() {
  var keys = [1, 2, 3];
  var values = ['one', 'two', 'three'];
  var map = Map.fromIterables(keys, values);
  print('Map from iterables: $map');
}

Output

Map from iterables: {1: one, 2: two, 3: three}

3 Create a map from boolean-string pairs

In this example,

  1. We create an iterable of keys containing booleans true, false and an iterable of values containing strings 'yes', 'no'.
  2. We then create a map using Map.fromIterables() with the provided keys and values iterables.
  3. The resulting map associates the keys with their corresponding values.
  4. We print the map to standard output.

Dart Program

void main() {
  var keys = [true, false];
  var values = ['yes', 'no'];
  var map = Map.fromIterables(keys, values);
  print('Map from iterables: $map');
}

Output

Map from iterables: {true: yes, false: no}

Summary

In this Dart tutorial, we learned about Map.fromIterables constructor of Map: the syntax and few working examples with output and detailed explanation for each example.