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# BASIC

BASIC interpreter

## Installation

1. You need to have at least version`v14.0.0` of [node.js](https://nodejs.org/en/) installed.

2. Install the `node-basic-lang` library globally:

```bash
npm install -g node-basic-lang
```

## Executing files

1. Create a BASIC program using the [supported commands](#supported-commands) below. Make sure that the file ends in `.bas`.

2. Run the BASIC program that you created

```bash
basic <program name>.bas
```

Example:

```bash
basic game.bas
```

## Using the REPL

You can use the REPL just by running the following command in the terminal:

 ```bash
basic
 ```

Make sure that you enter a unique line number for each command, just like you would a normal file. See [supported commands](#supported-commands) below for a list of commands you can use.

## Supported commands

`ABS` - Prints out the absolute value of a number.  
`CLS` - Clears the console.  
`INT` - Prints out an integer by rounding any decimal number down.  
`PRINT` - Prints lines to the console.  
`REM` - Comments for the user. The interpreter ignores these lines.  
`END` - Exits the program.

## Sample file

```bas
10 CLS
20 REM "BASIC HELLO WORLD PROGRAM"
30 PRINT "HELLO WORLD"
40 PRINT "HELLO WORLD 2X"
50 PRINT "HELLO WORLD 3X"
60 ABS "-3.14"
70 INT "1.6180"
80 END
```


node-basic-lang

jesselpalmer

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Ambiguous License Classifier

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What is bad text encoding?

Bad text encoding

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What is bad semver?

Bad semver

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What is bad dependency semver?

Bad dependency semver

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What are bidirectional unicode control characters?

Bidirectional unicode control characters

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What is bin script confusion?

Bin script confusion

This Chrome extension includes content scripts that execute JavaScript on specified websites.

What are Chrome extension content scripts?

Chrome Extension Content Script

This Chrome extension requests host permissions to access specific websites or domains.

What are Chrome extension host permissions?

Chrome Extension Host Permission

This Chrome extension requests permissions to access browser APIs, user data, or system features.

What are Chrome extension permissions?

Chrome Extension Permission

This Chrome extension requests wildcard host permissions that grant broad access to websites.

What are Chrome extension wildcard host permissions?

Chrome Extension Wildcard Host Permission

Semantic versions published out of chronological order.

What is a chronological version anomaly?

Chronological version anomaly

Project maintainer's SSH key has been compromised.

What is a compromised SSH key?

Compromised SSH key

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What do I need to know about license files?

Copyleft License

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What is a critical CVE?

Title

Critical CVE

Contains a high severity Common Vulnerability and Exposure (CVE).

What is a CVE?

High CVE

Uses debug, reflection and dynamic code execution features.

What is debug access?

Debug access

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What is a deprecated package?

Deprecated

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What is a deprecated SPDX exception?

Deprecated SPDX exception

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Deprecated license

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Possible typosquat attack

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What is dynamic require?

Dynamic require

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What is an empty package?

Empty package

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What is environment variable access?

Environment variable access

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What are extraneous dependencies?

Name

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File dependency

Accesses the file system, and could potentially read sensitive data.

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Filesystem access

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What are wildcard dependencies?

Wildcard dependency

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Alert title

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What are git dependencies?

Git dependency

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What are GitHub dependencies?

GitHub dependency

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What is an AI-detected potential code anomaly?

AI-detected potential code anomaly

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What is AI-detected potential typosquatting?

AI-detected possible typosquat

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What is AI-detected potential malware?

AI-detected potential malware

AI has determined that this package may contain potential security issues or vulnerabilities.

What are AI-detected potential security risks?

AI-detected potential security risk

Contains native code (e.g., compiled binaries or shared libraries). Including native code can obscure malicious behavior.

Why is native code a concern?

Native code

Contains high entropy strings. This could be a sign of encrypted data, leaked secrets or obfuscated code.

What are high entropy strings?

High entropy strings

Contains unicode homoglyphs which can be used in supply chain confusion attacks.

What are unicode homoglyphs?

Unicode homoglyphs

Contains a dependency which resolves to a remote HTTP URL which could be used to inject untrusted code and reduce overall package reliability.

What are http dependencies?

HTTP dependency

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

What is an install script?

Install scripts

Package has an invalid manifest file and can cause installation problems if you try to use it.

What is an invalid manifest file?

Invalid manifest file

Source files contain invisible characters. This could indicate source obfuscation or a supply chain attack.

What are invisible characters?

Invisible chars

(Experimental) Package license has recently changed.

What is a license change?

License change

(Experimental) Contains an SPDX license exception.

What is a license exception?

License exception

This package is not allowed per your license policy. Review the package's license to ensure compliance.

What is a license policy violation?

License Policy Violation

Contains long string literals, which may be a sign of obfuscated or packed code.

What's wrong with long strings?

Long strings

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

What is a major refactor?

Major refactor

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What is known malware?

Known malware

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What is manifest confusion?

Manifest confusion

Contains a medium severity Common Vulnerability and Exposure (CVE).

What is a medium CVE?

Medium CVE

Contains a low severity Common Vulnerability and Exposure (CVE).

What is a mild CVE?

Low CVE

This package contains minified code. This may be harmless in some cases where minified code is included in packaged libraries, however packages on npm should not minify code.

What's wrong with minified code?

Minified code

(Experimental) A package's licensing information has fine-grained problems.

Misc. License Issues

The package was published by an npm account that no longer exists.

What is a non-existent author?

Non-existent author

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What is a missing dependency?

Missing dependency

(Experimental) Package does not have a license and consumption legal status is unknown.

What is a missing license?

Missing license

This package is missing its tarball. It could be removed from the npm registry or there may have been an error when publishing.

What is a missing tarball?

Missing package tarball

(Experimental) Package contains multiple licenses.

What is a mixed license?

Mixed license

(Experimental) Package contains a modified version of an SPDX license exception. Please read carefully before using this code.

What is a modified license exception?

Modified license exception

(Experimental) Package contains a modified version of an SPDX license. Please read carefully before using this code.

What is a modified license?

Modified license

What is network access?

Network access

A new npm collaborator published a version of the package for the first time. New collaborators are usually benign additions to a project, but do indicate a change to the security surface area of a package.

What is new author?

New author

Package does not specify a list of contributors or an author in package.json.

Why is contributor and author data important?

No contributors or author data

Package does not have a linked bug tracker in package.json.

Why are bug trackers important?

No bug tracker

(Experimental) License information could not be found.

No License Found

Package does not have a README. This may indicate a failed publish or a low quality package.

Why are READMEs important?

No README

Package does not have a linked source code repository. Without this field, a package will have no reference to the location of the source code use to generate the package.

node-basic-lang

BASIC

Installation

Executing files

Using the REPL

Supported commands

Sample file

Keywords

Related posts

node-basic-lang

BASIC

Installation

Executing files

Using the REPL

Supported commands

Sample file

Keywords

Related posts

Feross on Risky Business Weekly Podcast: npm’s Ongoing Supply Chain Attacks

Introducing Tier 1 Reachability: Precision CVE Triage for Enterprise Teams