dbd.db/lib/util/findOne.js

A Lightweight Schema-Free Object-Oriented LocalDatabase for Development and Production Purpose

const isEqual = require('./isEqual')
const parseArray = require('./parseArray')

async function findOne(array, filter, keys) {
	if (!keys) keys = Object.keys(filter)

	let i = 0
	let index = -1

	find:
	while (i < array.length) {
		if (index > -1) break

		let k = 0

		while (k < keys.length) {
			if (index > -1) break

			if (Array.isArray(filter[keys[k]]) && Array.isArray(array[i][keys[k]])) {
				const res = await parseArray(filter[keys[k]], array[i][keys[k]])

				if (!res) {
					i++

					continue find
				}
			} else if (filter[keys[k]] instanceof Object && array[i][keys[k]] instanceof Object) {
				const res = await isEqual(filter[keys[k]], Object.keys(filter[keys[k]]), array[i][keys[k]])

				if (!res) {
					i++

					continue find
				}
			} else if (filter[keys[k]] !== array[i][keys[k]]) {
				i++

				continue find
			}

			k++
		}

		index = i

		break
	}

	if (index < 0) return {}

	return {
		item: array[index],
		index
	}
}

module.exports = findOne