_baseSortedIndex.js (1429B)
1 var baseSortedIndexBy = require('./_baseSortedIndexBy'), 2 identity = require('./identity'), 3 isSymbol = require('./isSymbol'); 4 5 /** Used as references for the maximum length and index of an array. */ 6 var MAX_ARRAY_LENGTH = 4294967295, 7 HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1; 8 9 /** 10 * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which 11 * performs a binary search of `array` to determine the index at which `value` 12 * should be inserted into `array` in order to maintain its sort order. 13 * 14 * @private 15 * @param {Array} array The sorted array to inspect. 16 * @param {*} value The value to evaluate. 17 * @param {boolean} [retHighest] Specify returning the highest qualified index. 18 * @returns {number} Returns the index at which `value` should be inserted 19 * into `array`. 20 */ 21 function baseSortedIndex(array, value, retHighest) { 22 var low = 0, 23 high = array == null ? low : array.length; 24 25 if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) { 26 while (low < high) { 27 var mid = (low + high) >>> 1, 28 computed = array[mid]; 29 30 if (computed !== null && !isSymbol(computed) && 31 (retHighest ? (computed <= value) : (computed < value))) { 32 low = mid + 1; 33 } else { 34 high = mid; 35 } 36 } 37 return high; 38 } 39 return baseSortedIndexBy(array, value, identity, retHighest); 40 } 41 42 module.exports = baseSortedIndex;