get-deep-property

getDeepProperty looks deep for the value of a plain JavaScript object property

• Gives access to any nested named property of plain object
• Uses exclusively a dot separated properties names list, in a string
• Array content can be addressed through index
• Returns the property value or undefined if it does not exist
• It should never throw an exception
• No dependency

Note: it comes with its own super tiny test framework…

Quick start

Install

Use npm as usual to install this package:

npm install @orange-opensource/get-deep-property

Or clone from GitHub:

$ git clone https://github.com/Orange-OpenSource/getDeepProperty.git
Cloning into 'getDeepProperty'...
[…]

Syntax

getDeepProperty(sourceObject, propertyPath)

Parameters:

• sourceObject: A JavaScript plain object with nested properties
• propertyPath: The deep name of the wanted property, as a string with dotted notation

Usage

In the file requiring the tool, just add a line like:

const getDeepProperty = require("@orange-opensource/get-deep-property");

Then you can use the only provided function as follow:

let value = getDeepProperty(sourceObject, 'path.to.a.property');

Examples

With the following object:

{
  part: "main",
  header: {
    name: "x-example",
    type: "string"
  }
}

And the property list named "header.name"

The result will be "x-example"

Another working example:

  const getDeepProperty = require("@orange-opensource/get-deep-property");

  const obj = {
    a: {
      b: true,
      c: 42
    }
  };

  const propertyPath = 'a.c';
  console.log("Result:", getDeepProperty(obj, propertyPath));

And the result will simply be:

Result: 42

License

This code is released under the BSD 3-clause license

Copyright (c) 2022 Orange SA

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.