Remove A Substring From A String In Dart

Expounding on Dart programming, we will be zooming into a detailed look at how to remove a substring from a string. This article aims to provide an understanding of this process through working code and an accompanying explanation.

Code snippet: Removing a Substring from a String in Dart

The first step is to set up our Dart code. Below is a simple example of how this can be achieved:

void main() {
  String str = 'Hello, world!';
  String subStr = 'world';
  
  str = str.replaceAll(subStr, '');
  
  print(str);
}

In this example, we are removing the substring ‘world’ from the string ‘Hello, world!’, leaving only ‘Hello,’ to be printed out.

Code Explanation: Removing a Substring from a String in Dart

Firstly, we start by defining our main() function where our code resides.

void main() { ... }

Inside this main() function, we define our string variable str which holds the value ‘Hello, world!‘. This is our main string from which we want to remove the substring.

String str = 'Hello, world!';

Next, we define another string variable subStr which is the substring that we want to remove from our main string. In our example, this is ‘world’.

String subStr = 'world';

To remove the subStr from str, we use the replaceAll() method of the String class in Dart. This function will replace all occurrences of the substring in the string with an empty string, thereby effectively removing it.

str = str.replaceAll(subStr, '');

Finally, we use the print() function to output our modified string. If everything works as intended, this will print the string ‘Hello,’ to the console.

print(str);

By following this guide, you can understand how to remove any substring from a string in Dart. Always remember that in the replaceAll() method, the first arugment is the substring we want to remove and the second argument is what we want to replace it with. In this case, we want to replace it with nothing, hence, the empty string.