Get Key or Default

Gets the value of an objects key, and falls back to a default value.

Example

let getKeyOrDefault = require('get-key-or-default');
 
// An object without a key
getKeyOrDefault({color: 'blue'}, 'height', 32);
// 32
 
// An object with a key
getKeyOrDefault({color: 'blue', height: 12}, 'height', 32);
// 12
 
// No object
getKeyOrDefault(undefined, 'height', 32);
// 32
 
// Validation
getKeyOrDefault({color: 'blue', height: 'twelve'}, 'height', 32, Number.isInteger);
// 32
 

Installation

$ npm install get-key-or-default

API

var getKeyOrDefault = require('get-key-or-default');

getKeyOrDefault(source, key, defaultValue, isValidCallback)

Type	Data Type	Name	Description
parameter	object	source	The object containing the key value.
parameter	string/number	key	The key that contains the value.
parameter	*	defaultValue	The result if the value is not found, or not valid.
parameter	function	isValidCallback	Evaluates if a value provided is valid.
returns	*	n/a	The source objects key value, otherwise the default value

isValidCallback(value)

The validation callback is fired when a defined value is evaluated.

Type	Data Type	Name	Description
parameter	!undefined	value	The value that is being validated.
returns	boolean	n/a	True if the value is valid, otherwise false.