70 lines
2.7 KiB
JavaScript
70 lines
2.7 KiB
JavaScript
import { masks } from 'dateformat';
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import { mapKeys, mapValues, pick, sortBy } from 'lodash';
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import { formatDate } from '~/lib/utils/datetime_utility';
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const { isoDate } = masks;
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/**
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* Takes an array of items and returns one item per month with the average of the `count`s from that month
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* @param {Array} items
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* @param {Number} items[index].count value to be averaged
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* @param {String} items[index].recordedAt item dateTime time stamp to be collected into a month
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* @param {Object} options
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* @param {Object} options.shouldRound an option to specify whether the retuned averages should be rounded
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* @return {Array} items collected into [month, average],
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* where month is a dateTime string representing the first of the given month
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* and average is the average of the count
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*/
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export function getAverageByMonth(items = [], options = {}) {
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const { shouldRound = false } = options;
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const itemsMap = items.reduce((memo, item) => {
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const { count, recordedAt } = item;
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const date = new Date(recordedAt);
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const month = formatDate(new Date(date.getFullYear(), date.getMonth(), 1), isoDate);
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if (memo[month]) {
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const { sum, recordCount } = memo[month];
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return { ...memo, [month]: { sum: sum + count, recordCount: recordCount + 1 } };
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}
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return { ...memo, [month]: { sum: count, recordCount: 1 } };
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}, {});
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return Object.keys(itemsMap).map(month => {
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const { sum, recordCount } = itemsMap[month];
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const avg = sum / recordCount;
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if (shouldRound) {
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return [month, Math.round(avg)];
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}
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return [month, avg];
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});
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}
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/**
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* Extracts values given a data set and a set of keys
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* @example
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* const data = { fooBar: { baz: 'quis' }, ignored: 'ignored' };
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* extractValues(data, ['fooBar'], 'foo', 'baz') => { bazBar: 'quis' }
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* @param {Object} data set to extract values from
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* @param {Array} dataKeys keys describing where to look for values in the data set
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* @param {String} replaceKey name key to be replaced in the data set
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* @param {String} nestedKey key nested in the data set to be extracted,
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* this is also used to rename the newly created data set
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* @return {Object} the newly created data set with the extracted values
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*/
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export function extractValues(data, dataKeys = [], replaceKey, nestedKey) {
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return mapKeys(pick(mapValues(data, nestedKey), dataKeys), (value, key) =>
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key.replace(replaceKey, nestedKey),
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);
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}
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/**
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* Creates a new array of items sorted by the date string of each item
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* @param {Array} items [description]
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* @param {String} items[0] date string
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* @return {Array} the new sorted array.
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*/
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export function sortByDate(items = []) {
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return sortBy(items, ({ recordedAt }) => new Date(recordedAt).getTime());
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}
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