# join-then-sum

Join an array of objects on a key, then sum elements in the join.

[![Build Status](http://img.shields.io/travis/urbanairship/join-then-sum/master.svg?style=flat)](https://travis-ci.org/urbanairship/join-then-sum)
[![npm install](http://img.shields.io/npm/dm/join-then-sum.svg?style=flat)](https://www.npmjs.org/package/join-then-sum)

## Example

```javascript
var joinsum = require('join-then-sum')
  , data

data = [
    {
      'i': 0
      'j': 0
      'v': 1
    }
  , {
      'i': 0
      'j': 0
      'v': 2
    }
  , {
      'i': 1
      'j': 0
      'v': 3
    }
  , {
      'i': 1
      'j': 1
      'v': 4
    }
  , {
      'i': 1
      'j': 1
      'v': '5'
    }
]

joinsum(data, ['i', 'j']) 
// returns:
// [
//     {i: 0, j: 0, v: 3}
//   , {i: 1, j: 0, v: 3}
//   , {i: 1, j: 1, v: 9}
// ]
```

Relies on [join-by-keys][join-by-keys] to join arrays of objects, and the sums
up the resulting arrays, leaving join keys alone. Array values are coerced to
Number prior to summing, which means non-coercible values will result in a NaN.

## License

This project is licensed under the Apache License, Version 2.0. See
[LICENSE][license] for the full license.

[join-by-keys]: https://github.com/urbanairship/join-by-keys
[license]: ./LICENSE


Join an array of objects on a key, then sum elements in the join. 

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join-then-sum

Join an array of objects on a key, then sum elements in the join.

(Experimental) An ambiguous license classifier was found.

What is an ambiguous license classifier?

Ambiguous License Classifier

Source files are encoded using a non-standard text encoding.

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Bad text encoding

Package version is not a valid semantic version (semver).

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Bad semver

Package has dependencies with an invalid semantic version. This could be a sign of beta, low quality, or unmaintained dependencies.

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Bad dependency semver

Source files contain bidirectional unicode control characters. This could indicate a Trojan source supply chain attack. See: trojansource.codes for more information.

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Bidirectional unicode control characters

This package has multiple bin scripts with the same name. This can cause non-deterministic behavior when installing or could be a sign of a supply chain attack.

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.

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Chrome Extension Wildcard Host Permission

Semantic versions published out of chronological order.

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Chronological version anomaly

Project maintainer's SSH key has been compromised.

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Compromised SSH key

(Experimental) Copyleft license information was found.

What do I need to know about license files?

Copyleft License

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Title

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Deprecated

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Deprecated SPDX exception

(Experimental) License is deprecated which may have legal implications regarding the package's use.

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Deprecated license

Package name is similar to other popular packages and may not be the package you want.

What is a typosquat?

Possible typosquat attack

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Dynamic require

Package does not contain any code. It may be removed, is name squatting, or the result of a faulty package publish.

What is an empty package?

Empty package

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Environment variable access

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Explicitly Unlicensed Item

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File dependency

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

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Filesystem access

Package has a dependency with a floating version range. This can cause issues if the dependency publishes a new major version.

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Wildcard dependency

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Alert title

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Git dependency

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GitHub dependency

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AI-detected possible typosquat

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AI-detected potential malware

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

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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.

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HTTP dependency

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

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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

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What are invisible characters?

Invisible chars

(Experimental) Package license has recently changed.

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License change

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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

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Manifest confusion

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Low CVE

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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.

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Non-existent author

A required dependency is not declared in package.json and may prevent the package from working.

What is a missing dependency?

Missing dependency

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

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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

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join-then-sum

join-then-sum

Example

License

Keywords

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join-then-sum

join-then-sum

Example

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Keywords

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