deno compile for standalone executables - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the command to compile a Deno script into a standalone executable.

Deno

deno compile [1] app script.ts

Drag options to blanks, or click blank then click option'

A--watch

B--run

C--output

D--reload

Attempts:

3 left

💡 Hint

Common Mistakes

Using --run instead of --output

Forgetting to specify the output file name

Using --reload which is for caching, not compiling

The --output flag specifies the name of the standalone executable file to create.

2fill in blank

medium

Complete the command to compile a Deno script for Linux platform.

Deno

deno compile --output app-linux --target [1] script.ts

Drag options to blanks, or click blank then click option'

Ax86_64-unknown-linux-gnu

Bdarwin

Cwindows

Dandroid

Attempts:

3 left

💡 Hint

Common Mistakes

Using windows or darwin instead of x86_64-unknown-linux-gnu

Omitting the --target flag

The --target flag sets the platform. For Linux, use x86_64-unknown-linux-gnu.

3fill in blank

hard

Fix the error in the command to compile a Deno script with permissions.

Deno

deno compile --allow-net [1] app script.ts

Drag options to blanks, or click blank then click option'

A--allow-read

B--output

C--target

D--unstable

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the output file name without the --output flag

Using permission flags instead of output flag

The --output flag is needed before the executable name app.

4fill in blank

hard

Fill both blanks to compile a Deno script for macOS with unstable features.

Deno

deno compile [1] app-mac --target [2] --unstable script.ts

Drag options to blanks, or click blank then click option'

A--output

B--allow-net

Cx86_64-apple-darwin

Dlinux

Attempts:

3 left

💡 Hint

Common Mistakes

Using linux instead of x86_64-apple-darwin for macOS

Forgetting the --output flag

Use --output to name the executable and x86_64-apple-darwin as the target for macOS.

5fill in blank

hard

Fill all three blanks to compile a Deno script with output name, target platform, and permission flag.

Deno

deno compile [1] myapp --target [2] [3] script.ts

Drag options to blanks, or click blank then click option'

A--output

Bx86_64-unknown-linux-gnu

C--allow-read

D--unstable

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up permission flags

Using wrong platform names

Omitting the --output flag

Use --output to name the executable, x86_64-unknown-linux-gnu as the target platform, and --allow-read to grant read permissions.

Practice

1. What is the main purpose of the deno compile command?

easy

A. To create a standalone executable from a Deno script

B. To install Deno on your computer

C. To run a Deno script without compiling

D. To update Deno to the latest version

Solution

1. Step 1: Understand the role of deno compile

   This command packages a Deno script into a single executable file that can run without needing Deno installed.

2. Step 2: Compare other options

   Installing Deno, running scripts without compiling, or updating Deno are done by different commands, not deno compile.

3. Final Answer:

   To create a standalone executable from a Deno script -> Option A

4. Quick Check:

   deno compile = create executable [OK]

Hint: Remember: compile means make a runnable file [OK]

Common Mistakes:

• Confusing compile with install
• Thinking compile runs scripts directly
• Mixing compile with update commands

2. Which of the following is the correct syntax to compile a Deno script named app.ts into a standalone executable named app.exe on Windows?

easy

A. deno run --output app.exe app.ts

B. deno compile --output app.exe app.ts

C. deno build app.ts -o app.exe

D. deno compile app.ts --exe app.exe

Solution

1. Step 1: Recall the correct deno compile syntax

   The command uses deno compile --output [filename] [script] to specify output executable and source file.

2. Step 2: Check other options for errors

   deno run runs scripts but does not compile; deno build is not a valid command; --exe is not a recognized flag.

3. Final Answer:

   deno compile --output app.exe app.ts -> Option B

4. Quick Check:

   compile + --output + script = correct syntax [OK]

Hint: Use --output to name your executable [OK]

Common Mistakes:

• Using deno run instead of deno compile
• Wrong flag like --exe instead of --output
• Mixing command order

3. Given the command deno compile --output hello hello.ts and hello.ts contains console.log('Hello Deno!');, what will happen when you run the generated executable?

medium

A. It opens a browser window

B. It throws a syntax error

C. It does nothing

D. It prints 'Hello Deno!' to the console

Solution

1. Step 1: Understand the compiled executable behavior

   The executable runs the script code, so it will print the message to the console.

2. Step 2: Eliminate incorrect options

   No syntax error occurs because the script is valid; it does not open a browser or stay silent.

3. Final Answer:

   It prints 'Hello Deno!' to the console -> Option D

4. Quick Check:

   Compiled script output = printed message [OK]

Hint: Compiled executable runs script code as is [OK]

Common Mistakes:

• Expecting compile to change output
• Thinking compile causes errors
• Assuming GUI opens automatically

4. You tried to compile your script with deno compile --output myapp myapp.ts but got an error: PermissionDenied: read access to file 'myapp.ts' is required. What is the best way to fix this?

medium

A. Add --allow-read flag to the compile command

B. Run the command as administrator

C. Add --allow-run flag to the compile command

D. Rename the script file to myapp.js

Solution

1. Step 1: Understand the permission error

   The error says read access is denied for the script file, which is required to compile the source file.

2. Step 2: Identify correct permission flag

   --allow-read grants permission to read files, which is required to compile the script.

3. Final Answer:

   Add --allow-read flag to the compile command -> Option A

4. Quick Check:

   PermissionDenied = missing --allow-read [OK]

Hint: Use --allow-read to fix file access errors [OK]

Common Mistakes:

• Using --allow-run instead of --allow-read
• Thinking admin rights fix permission errors
• Renaming file without fixing permissions

5. You want to create a standalone executable for Linux from a Deno script server.ts on a Windows machine. Which command correctly compiles it for Linux?

hard

A. deno compile --output server-linux --platform linux server.ts

B. deno compile --output server-linux --os linux server.ts

C. deno compile --output server-linux --target x86_64-unknown-linux-gnu server.ts

D. deno compile --output server-linux --target linux-x64 server.ts

Solution

1. Step 1: Understand cross-compilation with deno compile

   You must specify the target triple for the desired OS and architecture using --target.

2. Step 2: Identify the correct target triple for Linux x64

   x86_64-unknown-linux-gnu is the standard target triple for 64-bit Linux.

3. Step 3: Check other options for invalid flags or values

   --platform and --os are not valid flags; linux-x64 is not a recognized target triple.

4. Final Answer:

   deno compile --output server-linux --target x86_64-unknown-linux-gnu server.ts -> Option C

5. Quick Check:

   Cross-compile uses --target with correct triple [OK]

Hint: Use --target with OS-arch triple for cross-compiling [OK]

Common Mistakes:

• Using invalid flags like --platform or --os
• Wrong target triple format
• Assuming compile auto-detects target OS