[Write your first Flutter app codelab] Remove const isn't mentioned #4369

jshrek · 2020-03-26T23:13:20Z

On the following page of tutorial, I found the following issues:
https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1/#3

PROBLEM flutter/flutter#1
Following these steps, on this page, gives the following error:
Compiler message:

lib/main.dart:17:23: Error: Not a constant expression. 
          child: Text(wordPair.asPascalCase),

The issue is that you need to change this line:
body: const Center(

To this line (remove const):
body: Center( // remove const

Please add this to turorial.

PROBLEM flutter/flutter#2
After correcting the above error, I then get this error:
Compiler message:

lib/main.dart:17:32: Error: The getter 'asPascalCase' isn't defined for the class 'String'.
Try correcting the name to the name of an existing getter, or defining a getter or field named 'asPascalCase'.
          child: Text(wordPair.asPascalCase),
                               ^^^^^^^^^^^^

Apparently it does not recognise asPascalCase by default. To fix it, I changed .asPascalCase to .asString.

But need to add instructions to tutorial on how to make asPascalCase work.
Thanks

The text was updated successfully, but these errors were encountered:

jshrek · 2020-03-26T23:20:49Z

For Problem flutter/flutter#2 above, it seems that .asPascalCase is available only after running in the android emulator. Initially I was running on "Web Server (web)" which gave the error. After I run on android emulator, the "Web Server (web)" device no longer had the error and worked as expected.

iapicca · 2020-03-27T07:15:13Z

Hi @jshrek
I just run the code provider at the bottom of the page you linked

Problems?

If your app isn't running correctly, look for typos. If needed, use the code at the following links to get back on track.

pubspec.yaml
lib/main.dart

logs

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

// https://github.com/flutter/codelabs/tree/b3293b5bb0c0187bdbe8112f7759f4d75f4c040a/startup_namer/step2_use_package
// from https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1/#3 bottom page

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final wordPair = WordPair.random();
    return MaterialApp(
      title: 'Welcome to Flutter',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Welcome to Flutter'),
        ),
        body: Center(
          child: Text(wordPair.asPascalCase),
        ),
      ),
    );
  }
}

it seems to work as intended

logs

 nevercode@Nevercodes-Air  ~/Desktop/projects/twentyseven_march  flutter_dev run -d chrome --verbose                                                        ✔  753  09:06:41
[  +27 ms] executing: [/Users/nevercode/development/flutter_dev/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[  +57 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] 58cad787d89cc12e72f1f0ec3f1df6a9796ef029
[        ] executing: [/Users/nevercode/development/flutter_dev/] git describe --match v*.*.* --first-parent --long --tags
[  +23 ms] Exit code 0 from: git describe --match v*.*.* --first-parent --long --tags
[        ] v1.16.2-0-g58cad787d
[  +10 ms] executing: [/Users/nevercode/development/flutter_dev/] git rev-parse --abbrev-ref --symbolic @{u}
[  +17 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/dev
[        ] executing: [/Users/nevercode/development/flutter_dev/] git ls-remote --get-url origin
[  +17 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[  +92 ms] executing: [/Users/nevercode/development/flutter_dev/] git rev-parse --abbrev-ref HEAD
[  +17 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[   +1 ms] dev
[   +8 ms] executing: sw_vers -productName
[  +33 ms] Exit code 0 from: sw_vers -productName
[        ] Mac OS X
[        ] executing: sw_vers -productVersion
[  +21 ms] Exit code 0 from: sw_vers -productVersion
[   +1 ms] 10.15.4
[        ] executing: sw_vers -buildVersion
[  +24 ms] Exit code 0 from: sw_vers -buildVersion
[        ] 19E266
[  +42 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +3 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[  +27 ms] executing: /Users/nevercode/Library/Android/sdk/platform-tools/adb devices -l
[  +17 ms] executing: /usr/bin/xcode-select --print-path
[  +12 ms] Exit code 0 from: /usr/bin/xcode-select --print-path
[        ] /Applications/Xcode.app/Contents/Developer
[   +2 ms] executing: /usr/bin/xcodebuild -version
[+1333 ms] Exit code 0 from: /usr/bin/xcodebuild -version
[   +3 ms] Xcode 11.3.1
           Build version 11C504
[   +5 ms] executing: xcrun --find xcdevice
[  +20 ms] Exit code 0 from: xcrun --find xcdevice
[        ] /Applications/Xcode.app/Contents/Developer/usr/bin/xcdevice
[        ] executing: xcrun xcdevice list --timeout 1
[   +5 ms] /usr/bin/xcrun simctl list --json devices
[        ] executing: /usr/bin/xcrun simctl list --json devices
[  +74 ms] List of devices attached
[ +210 ms] {
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                            "state" : "Shutdown",
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                            "state" : "Shutdown",
                            "isAvailable" : true,
                            "name" : "iPad (7th generation)",
                            "udid" : "50905834-EA49-46D1-9282-2BFD80B002C9"
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                          {
                            "state" : "Shutdown",
                            "isAvailable" : true,
                            "name" : "iPad Pro (11-inch)",
                            "udid" : "C37B8020-20B5-44D3-BB6B-1E34569A3E57"
                          },
                          {
                            "state" : "Shutdown",
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                            "name" : "iPad Pro (12.9-inch) (3rd generation)",
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[+3609 ms] [
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                        "available" : true,
                        "platform" : "com.apple.platform.iphonesimulator",
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                        "platform" : "com.apple.platform.iphonesimulator",
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                        "architecture" : "x86_64",
                        "modelName" : "iPhone 11",
                        "name" : "iPhone 11"
                      },
                      {
                        "simulator" : true,
                        "operatingSystemVersion" : "13.3 (17C45)",
                        "available" : true,
                        "platform" : "com.apple.platform.iphonesimulator",
                        "modelCode" : "iPad7,12",
                        "identifier" : "50905834-EA49-46D1-9282-2BFD80B002C9",
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                        "available" : true,
                        "platform" : "com.apple.platform.watchsimulator",
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                        "identifier" : "7F389A7F-C267-412A-8DB8-63A83386A06F",
                        "architecture" : "i386",
                        "modelName" : "Apple Watch Series 4 - 40mm",
                        "name" : "Apple Watch Series 4 - 40mm"
                      },
                      {
                        "simulator" : true,
                        "operatingSystemVersion" : "6.1.1 (17S445)",
                        "available" : true,
                        "platform" : "com.apple.platform.watchsimulator",
                        "modelCode" : "Watch5,4",
                        "identifier" : "AF6A4F31-535E-4FE6-A062-49A81AB5AAE3",
                        "architecture" : "i386",
                        "modelName" : "Apple Watch Series 5 - 44mm",
                        "name" : "Apple Watch Series 5 - 44mm"
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[  +14 ms] Artifact Instance of 'AndroidMavenArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidGenSnapshotArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'AndroidInternalBuildArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +4 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerDebugSymbols' is not required, skipping update.
[ +246 ms] Generating /Users/nevercode/Desktop/projects/twentyseven_march/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
[ +378 ms] Launching lib/main.dart on Chrome in debug mode...
[  +61 ms] Updating assets
[ +162 ms] Syncing files to device Chrome...
[  +65 ms] Generating /Users/nevercode/Desktop/projects/twentyseven_march/android/app/src/main/java/io/flutter/plugins/GeneratedPluginRegistrant.java
[  +68 ms] <- reset
[  +20 ms] /Users/nevercode/development/flutter_dev/bin/cache/dart-sdk/bin/dart
/Users/nevercode/development/flutter_dev/bin/cache/artifacts/engine/darwin-x64/frontend_server.dart.snapshot --sdk-root
/Users/nevercode/development/flutter_dev/bin/cache/flutter_web_sdk/ --incremental --target=dartdevc --debugger-module-names -Ddart.developer.causal_async_stacks=true
--output-dill /var/folders/c3/l5jpznsj5k37yrj47l__xpw40000gn/T/flutter_tool.jnMhfA/app.dill --libraries-spec
file:///Users/nevercode/development/flutter_dev/bin/cache/flutter_web_sdk/libraries.json --packages /Users/nevercode/Desktop/projects/twentyseven_march/.packages
-Ddart.vm.profile=false -Ddart.vm.product=false
--bytecode-options=source-positions,local-var-info,debugger-stops,instance-field-initializers,keep-unreachable-code,avoid-closure-call-instructions --enable-asserts
--track-widget-creation --filesystem-root /var/folders/c3/l5jpznsj5k37yrj47l__xpw40000gn/T/flutter_tools.OCGLqC --filesystem-scheme org-dartlang-app --initialize-from-dill
build/cache.dill --platform file:///Users/nevercode/development/flutter_dev/bin/cache/flutter_web_sdk/kernel/flutter_ddc_sdk.dill
[  +24 ms] <- compile org-dartlang-app:///web_entrypoint.dart
[+18206 ms] Syncing files to device Chrome... (completed in 18,376ms, longer than expected)
[   +1 ms] Synced 21.1MB.
[   +1 ms] <- accept
[+1023 ms] [CHROME]:
[   +1 ms] [CHROME]:DevTools listening on ws://127.0.0.1:51991/devtools/browser/61beafe6-0bee-4daa-8769-6869e759629f
[+5063 ms] Debug service listening on ws://127.0.0.1:52016/qlKjo3FjtjI=

[ +670 ms] Debug service listening on ws://127.0.0.1:52016/qlKjo3FjtjI=
[   +3 ms] Warning: Flutter's support for web development is not stable yet and hasn't
[        ] been thoroughly tested in production environments.
[        ] For more information see https://flutter.dev/web
[        ] 🔥  To hot restart changes while running, press "r". To hot restart (and refresh the browser), press "R".
[   +6 ms] For a more detailed help message, press "h". To quit, press "q".
[+8988 ms] Application finished.
[  +70 ms] Stopped debug service on ws://127.0.0.1:52016

nevertheless I'll leave the issue open to update the steps provided
thank you for reporting this

imwithsam · 2020-06-29T13:30:12Z

I ran into Problem 1 as well. It would also help if the commented out 'Hello World' line had the const left in it for consistency and to make it clearer that Text(wordPair.asPascalCase) should not have const in front of it.

i.e.

        body: Center(   // Remove const
          //child: const Text('Hello World'),   // Replace this text...
          child: Text(wordPair.asPascalCase),  // With this text.
        ),

Where is this file located? I would happily submit a pull request but could not find this tutorial doc on GitHub.

Pragya007 · 2020-07-17T05:50:56Z

@TahaTesser Are the repo for this file is private to you team members?

TahaTesser · 2020-07-17T08:28:03Z

Hi @Pragya007
They aren't private, there is a different repository https://github.com/flutter/codelabs and you can find Step 4, here https://github.com/flutter/codelabs/blob/master/startup_namer/step4_infinite_list/lib/main.dart

Pragya007 · 2020-07-17T09:57:21Z

Hey @TahaTesser So if I change these files will it reflect on this page:
https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1/#3

I am asking for these docs repository.

TahaTesser · 2020-07-17T13:37:01Z

@Pragya007
Fork this repository, makes changes and create a pull and it will show up https://github.com/flutter/codelabs/pulls and if merged, it will reflect in https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1/#3

Pragya007 · 2020-07-17T13:46:56Z

body: Center( //child: Text('Hello World'), // Replace this text... child: Text(wordPair.asPascalCase), // With this text. ),

@TahaTesser I have already forked it but I could not find this in https://github.com/flutter/codelabs/tree/master/startup_namer/step4_infinite_list/lib

I need to change above lines in the doc's code snippet but I think they are not present here..

Pragya007 · 2020-07-17T14:09:11Z

@TahaTesser Hey I think to solve this issue the image of code on:
https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1/#2
https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1/#3

needs to be changed because the code written in lib/main.dart are different from what are shown in the images here in both the pages, and that is what creating a confusion just due the word const. So the const is not there in the original codes in the repository but due to old images confusion is there.
If it is possible to change those images of page(if public repo) then I can do that, I think this should close this issue .

TahaTesser · 2020-07-17T14:57:18Z

@Pragya007
I can repository doesn't have const. Can you create an issue here https://github.com/flutter/website/issues?

Pragya007 · 2020-07-17T15:10:39Z

Sure!

tafa-mustafa · 2021-02-27T13:08:49Z

remove const in the body it will work

tafa-mustafa · 2021-02-27T13:11:59Z

body: const Center(
child: Text(wordPair.asPascalCase),
),

==> body: Center(
child: Text(wordPair.asPascalCase),
),

domesticmouse · 2021-08-23T07:07:40Z

Looking at https://codelabs.developers.google.com/codelabs/first-flutter-app-pt1/#3 the issue with the errant const seems to be resolved.

TahaTesser changed the title ~~Tutorial part 1 issues~~ [Write your first Flutter app codelab] Remove const isn't mentioned Jun 29, 2020

sfshaza2 transferred this issue from flutter/flutter Jul 20, 2020

sfshaza2 added a.tut.codelab Relates to codelab hosted on docs.flutter.dev a.tut.codelab-google Relates to codelabs hosted on codelabs.developers.google.com e1-hours Effort: < 8 hrs p2-medium Necessary but not urgent concern. Resolve when possible. labels Jul 20, 2020

domesticmouse closed this as completed Aug 23, 2021

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[Write your first Flutter app codelab] Remove const isn't mentioned #4369

[Write your first Flutter app codelab] Remove const isn't mentioned #4369

[Write your first Flutter app codelab] Remove const isn't mentioned #4369

[Write your first Flutter app codelab] Remove const isn't mentioned #4369

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