How to get the ASCII value of a character in dart

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Dart print the ASCII value of a character

Introduction :

In dart, strings are a sequence of UTF-16 code units. Or each character is represented as UTF-16. Dart String class provides two different methods to get the code unit of a character in the string or to get all code units.

In this tutorial, we will learn how to print the code unit of each character in a string one by one and how to get all code units of all characters.

Following are the methods that we are going to use :

 

String.codeUnitAt :

This method is used to print the code unit of a character in the string using its index value. The index starts from 0 i.e. 0 is the index of the first character, 1 is the index of the second character etc. This method is defined as below :

int codeUnitAt(int index)

As you can see that it takes the index of the character as the parameter and returns one int value, i.e. the code unit for that character.

 

String.codeUnits :

This method is used to get all code units of string characters. It is defined as below :

List codeUnits

It returns a list with all code units of the string. The list is unmodifiable.

 

Example to print all code units of a string :

Let’s learn the above methods with an example. We will print the code units of each character of a string one by one using codeUnitAt and also we will print the list of all code units in the string :

void main() {
  String s = "Hello World";

  for (int i = 0; i < s.length; i++) {
    print("Code unit for ${s[i]} is ${s.codeUnitAt(i)}");
  }

  print("Code unit list ${s.codeUnits}");
}

 

Output :

Code unit for H is 72
Code unit for e is 101
Code unit for l is 108
Code unit for l is 108
Code unit for o is 111
Code unit for   is 32
Code unit for W is 87
Code unit for o is 111
Code unit for r is 114
Code unit for l is 108
Code unit for d is 100
Code unit list [72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]

dart ascii value of a character

Categories: dart

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