Dart .length

In Dart, the .length property returns the number of characters within a given string, including emojis and special symbols. The characters are measured in UTF-16 code units.

Note: The UTF-16 code units refer to the number of 16-bit values used to encode the characters in the string.

Syntax

string.length;

• string: The name of the string to be checked.

Examples

The following example demonstrates the use of the .length property:

void main() {
  String firstString = "I love Codecademy";
  String secondString = "I love Codecademy😍";

  int lengthOfFirstString = firstString.length;
  int lengthOfSecondString = secondString.length;

  print(lengthOfFirstString);
  print(lengthOfSecondString);
}

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The above code produces the following output:

17
19

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Note: The emoji 😍 takes 2 UTF-16 code units.

The following example computes the length of an empty string:

void main() {
  String emptyString = "";

  int lengthOfEmptyString = emptyString.length;

  print(lengthOfEmptyString);
}

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The output for the above code is as follows:

0

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