00001 var isSymbol = require('./isSymbol');
00002
00004 var MAX_ARRAY_LENGTH = 4294967295,
00005 MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1;
00006
00007
00008 var nativeFloor = Math.floor,
00009 nativeMin = Math.min;
00010
00024 function baseSortedIndexBy(array, value, iteratee, retHighest) {
00025 value = iteratee(value);
00026
00027 var low = 0,
00028 high = array == null ? 0 : array.length,
00029 valIsNaN = value !== value,
00030 valIsNull = value === null,
00031 valIsSymbol = isSymbol(value),
00032 valIsUndefined = value === undefined;
00033
00034 while (low < high) {
00035 var mid = nativeFloor((low + high) / 2),
00036 computed = iteratee(array[mid]),
00037 othIsDefined = computed !== undefined,
00038 othIsNull = computed === null,
00039 othIsReflexive = computed === computed,
00040 othIsSymbol = isSymbol(computed);
00041
00042 if (valIsNaN) {
00043 var setLow = retHighest || othIsReflexive;
00044 } else if (valIsUndefined) {
00045 setLow = othIsReflexive && (retHighest || othIsDefined);
00046 } else if (valIsNull) {
00047 setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
00048 } else if (valIsSymbol) {
00049 setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
00050 } else if (othIsNull || othIsSymbol) {
00051 setLow = false;
00052 } else {
00053 setLow = retHighest ? (computed <= value) : (computed < value);
00054 }
00055 if (setLow) {
00056 low = mid + 1;
00057 } else {
00058 high = mid;
00059 }
00060 }
00061 return nativeMin(high, MAX_ARRAY_INDEX);
00062 }
00063
00064 module.exports = baseSortedIndexBy;