Home how to return the whole element value length that contains specific letters using String method in dart

Questions

how to return the whole element value length that contains specific letters using String method in dart

February 2, 2022

here i have String list and String variable which cotwins the wanted letters

List myBooks ['hello world' , 'hello dart', 'hello flutter'] ;

String isBook = 'flutter' // here i target the hello flutter element

here i have Text Widget and String Method

Text(getBook(isBook ))

String getBook(String isBook ){
 return // here i need to return the whole length of element that contains 'flutter'
so i need to get 'hello flutter'
}

How to handle this

>Solution :

You can use List.firstWhere to find element and .contains() to check value;

String getBook(String isBook) {
  List myBooks = ['hello world', 'hello dart', 'hello flutter'];

  return myBooks.firstWhere((b) => b.contains(isBook));
}

void main() {
  String isBook = 'flutter';
  
  print(getBook(isBook)); // hello flutter
}