each-props

Processes each properties of an object deeply.

Install

To install from npm:

$ npm i each-props --save

Usage

Apply a function to all (non plain object) properties.

const eachProps = require('each-props');

var obj = { a: 1, b: { c: 'CCC', d: { e: 'EEE' } } };

eachProps(obj, function (value, keyChain, nodeInfo) {
  if (keyChain === 'a') {
    nodeInfo.parent['a'] = value * 2;
  } else if (keyChain === 'b.c') {
    nodeInfo.parent['c'] = value.toLowerCase();
  } else if (keyChain === 'b.d') {
    return true; // stop to dig
  } else if (keyChain === 'b.d.e') {
    nodeInfo.parent['e'] = value.toLowerCase();
  }
});

console.log(obj);
// => { a: 2, b: { c: 'ccc', d: { e: 'EEE' } } };

API

eachProps(obj, fn [, opts]) : void

Executes the fn function for all properties.

Parameters:

| Parameter | Type | Description | | :-------- | :------: | :--------------------------------------------- | | obj | object | A plain object to be treated. | | fn | function | A function to operate each properties. | | opts | object | An object to pass any data to each properties. |

• API of fn function

  fn(value, keyChain, nodeInfo) : boolean

  This function is applied to all properties in an object.

  Parameters:

  | Parameter | Type | Description | | :--------- | :----: | :------------------------------------------------------------------ | | value | any | A property value. | | keyChain | string | A string concatenating the hierarchical keys with dots. | | nodeInfo | object | An object which contains node informations (See below). |

  Returns:

  True, if stops digging child properties.

  Type: boolean

• Properties of nodeInfo

  | Properties | Type | Description | | :--------- | :------: | :---------------------------------------------------------------------------------------------------------- | | name | string | The property name of this node. | | index | number | The index of the property among the sibling properties. | | count | number | The count of the sibling properties. | | depth | number | The depth of the property. | | parent | object | The parent node of the property. | | sort | function | A sort function which orders the child properties. This function is inherited from opts, if be specified. |

  ... and any properties inherited from opts.

• Properties of opts

  | Properties | Type | Description | | :--------- | :------: | :----------------------------------------------------------------- | | sort | function | A sort function which orders the same level properties. (Optional) |

  ... and any properties you want to pass to each node.

License

MIT