getNestedProperty.ts

/**
 * Safely gets a value from object using the provided path. Return `undefined` if it doesn't exist
 * Similar to lodash.get: https://lodash.com/docs/#get
 *
 * @param {{}} obj - target object
 * @param {string} path - path to a nested value
 * @param {*} defaultValue - gets returned if path resolved to `undefined`
 *
 *  @see https://gist.github.com/jeneg/9767afdcca45601ea44930ea03e0febf#gistcomment-1935901
 */
const getNestedProperty = (
	obj: Record<string, any>,
	path: string,
	defaultValue?: unknown
): any =>
	path
		.replace(/\[(\d+)]/g, '.$1')
		.split('.')
		.filter(Boolean)
		.every((step: string | number) => (obj = obj[step]) !== undefined)
		? obj
		: defaultValue

export default getNestedProperty