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backend/node_modules/date-fns/closestIndexTo/index.js

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+"use strict";
+
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = closestIndexTo;
+var _index = _interopRequireDefault(require("../toDate/index.js"));
+var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
+/**
+ * @name closestIndexTo
+ * @category Common Helpers
+ * @summary Return an index of the closest date from the array comparing to the given date.
+ *
+ * @description
+ * Return an index of the closest date from the array comparing to the given date.
+ *
+ * @param {Date | Number} dateToCompare - the date to compare with
+ * @param {Array<Date> | Array<number>} datesArray - the array to search
+ * @returns {Number | undefined} an index of the date closest to the given date or undefined if no valid value is given
+ * @throws {TypeError} 2 arguments required
+ *
+ * @example
+ * // Which date is closer to 6 September 2015?
+ * const dateToCompare = new Date(2015, 8, 6)
+ * const datesArray = [
+ *   new Date(2015, 0, 1),
+ *   new Date(2016, 0, 1),
+ *   new Date(2017, 0, 1)
+ * ]
+ * const result = closestIndexTo(dateToCompare, datesArray)
+ * //=> 1
+ */
+function closestIndexTo(dirtyDateToCompare, dirtyDatesArray) {
+  (0, _index2.default)(2, arguments);
+  var dateToCompare = (0, _index.default)(dirtyDateToCompare);
+  if (isNaN(Number(dateToCompare))) return NaN;
+  var timeToCompare = dateToCompare.getTime();
+  var datesArray;
+  // `dirtyDatesArray` is undefined or null
+  if (dirtyDatesArray == null) {
+    datesArray = [];
+
+    // `dirtyDatesArray` is Array, Set or Map, or object with custom `forEach` method
+  } else if (typeof dirtyDatesArray.forEach === 'function') {
+    datesArray = dirtyDatesArray;
+
+    // If `dirtyDatesArray` is Array-like Object, convert to Array. Otherwise, make it empty Array
+  } else {
+    datesArray = Array.prototype.slice.call(dirtyDatesArray);
+  }
+  var result;
+  var minDistance;
+  datesArray.forEach(function (dirtyDate, index) {
+    var currentDate = (0, _index.default)(dirtyDate);
+    if (isNaN(Number(currentDate))) {
+      result = NaN;
+      minDistance = NaN;
+      return;
+    }
+    var distance = Math.abs(timeToCompare - currentDate.getTime());
+    if (result == null || distance < Number(minDistance)) {
+      result = index;
+      minDistance = distance;
+    }
+  });
+  return result;
+}
+module.exports = exports.default;