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Deno installation

Installation

The simplest way to install deno is to download and run the scripts provided by deno_install using shell or powershell( for windows).

  • Linux / Mac
curl -fsSL https://deno.land/x/install/install.sh | sh
  • Windows
iwr https://deno.land/x/install/install.ps1 -useb | iex

Facing problem while installation ?

The installation process will work for most of you. But, few of you will face the following error on your shell console.


.\install.ps1 : File C:\install.ps1 cannot be loaded because running scripts is disabled on this system. For more information, see about_Execution_Policies at https:/go.microsoft.com/fwlink/?LinkID=135170.
At line:1 char:71
+ ... /x/install/install.ps1 -useb -outf install.ps1; .\install.ps1 v0.38.0
+                                                     ~~~~~~~~~~~~~
    + CategoryInfo          : SecurityError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : UnauthorizedAccess

Don’t worry just follow the below steps:

  • Download the .zip file of latest deno release.
  • Extract the .zip file and copy the location of deno.exe.
  • Open My Computer > Advanced System Settings > Environment Variables
  • Add the location as new path in system variables.

You have completed the installation process. Now, its time to verify it.

Open Command Prompt or Terminal and run the following command.

deno --version

It will print the following information :

deno 1.0.1             // deno version
v8 8.4.300             // version of javascript engine 
typescript 3.9.2       // typescript version

Environment Setup

Deno is very new, and currently not many IDEs / Text editors support it. My suggestion : Go for Visual Studio Code.It is a pretty good IDE and offers an extension with the name Deno for development.

Deno says ‘Hello World!’

Your setup is now ready to create a hello world script in Deno. Copy the below code in a new file.

for (let i = 0; i < 13; i++) {
  console.log("Hello World -Deno");
}

Save the file as ‘hello-deno.ts’ , the name is not important it could be anything but use .ts as the file type. Now, open the command prompt / terminal in the file location and run following command to execute the deno script.

deno run hello-deno.ts

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