node-red-contrib-differences

This Node-RED node will compare two inputs, then create output based on how the inputs differ.

Output functions include:

• Complement: What's in one input, but not the other
• Intersection: What's common in both inputs
• Union: Everything from both inputs

Usage

Drag and Drop the "Differences" node onto the canvas. Set the Left and Right input values to the source sets, set the Function value baed on how you want differences between the left and right sets treated, and the Output value to the destination property.

Examples

See also example-flow.json.

Complement

Input as an array:

// "Left" (desired)
[ "gadget", "gizmo", "thingamabob" ]

// "Right" (owned)
[ "widget", "gadget" ]

// Output:
[ "gizmo", "thingamabob" ]

Input as an object:

// "Left" (desired)
{ gadgets: 2, gizmos: 3, thingamabobs: 4, whatchamacallits: 3 }

// "Right (owned)
{ widgets: 1, gadgets: 2, whatchamacallits: 2 }

// Output:
{ gizmos: 3, thingamabobs: 4, whatchamacallits: 3 }

Intersection

Input as an array:

// "Left"
[ "widget", "gadget" ]

// "Right"
[ "gadget", "gizmo", "thingamabob" ]

// Output:
[ "gadget" ]

Input as an object:

// "Left"
{ widgets: 1, gadgets: 2, whatchamacallits: 2 }

// "Right"
{ gadgets: 2, gizmos: 3, thingamabobs: 4, whatchamacallits: 3 }

// Output:
{ gadgets: 2 }

Union

Input as an array:

// "Left"
[ "widget", "gadget" ]

// "Right"
[ "gadget", "gizmo", "thingamabob" ]

// Output:
[ "gadget", "widget", "gizmo", "thingamabob" ]

Input as an object:

// "Left"
{ widgets: 1, gadgets: 2, whatchamacallits: 2 }

// "Right"
{ gadgets: 2, gizmos: 3, thingamabobs: 4, whatchamacallits: 3 }

// Output:
{ widgets: 1, gadgets: 2, gizmos: 3, thingamabobs: 4, whatchamacallits: [2, 3] }

Contribute Quick Start

Fork this repository, then:

git clone https://github.com/tmobile/node-red-contrib-differences.git
cd node-red-contrib-differences
npm run build
cd ~/.node-red
npm install <path to cloned repository> --save
node-red

When you're finished with your changes, merge requests are welcome!