How do I use this code from the FLutter Engish

I'm trying to learn Flutter (As someone without a lot of programming background) and in a tutorial have just learned how to import the English Words package.

I have tried to use the example code as shown at: https://pub.dev/packages/english_words

The error I receive is: This expression has a type of void so it's value cannot be used. It is the line: nouns.take(50).forEach(print); that gives the error.

This is the code:

import 'package:flutter/material.dart';
import 'package:english_words/english_words.dart';

void main() {
  home: Scaffold(
    body: SafeArea(
      child: Center(
        child: Container(
          child: Text(
              nouns.take(50).forEach(print);
          ),
        ),
      ),
    ),
  );

  }

Thanks for any clues.

CodePudding user response：

Everything in flutter is a Widget as well as Text, used as a child of Container widget.

The error I receive is: This expression has a type of void so its value cannot be used. It is the line: nouns.take(50).forEach(print); that gives the error.

the line: nouns.take(50).forEach(print), actually return a list of 50 most used nouns and printing them. In Dart & Flutter print is a function that return void. void means nothing. so the line nouns.take(50).forEach(print) actually returns nothing but Text Widget requires String in order to display on screen.

CodePudding user response：

The error occurs because nouns returns a List<String> and foreach is a void method, which returns nothing. But your Text requires a String. If you want to display all nouns make use of ListView. Below is a small example.

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final List<String> words = nouns.take(50).toList();

    return MaterialApp(
      home: Scaffold(
        body: ListView.builder(
          itemBuilder: (context, index) => Text(words[index]),
          itemCount: words.length,
        ),
      ),
    );
  }
}