68 lines
2.2 KiB
JavaScript
68 lines
2.2 KiB
JavaScript
var isSymbol = require('./isSymbol');
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/** Used as references for the maximum length and index of an array. */
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var MAX_ARRAY_LENGTH = 4294967295,
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MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1;
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/* Built-in method references for those with the same name as other `lodash` methods. */
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var nativeFloor = Math.floor,
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nativeMin = Math.min;
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/**
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* The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
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* which invokes `iteratee` for `value` and each element of `array` to compute
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* their sort ranking. The iteratee is invoked with one argument; (value).
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*
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* @private
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* @param {Array} array The sorted array to inspect.
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* @param {*} value The value to evaluate.
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* @param {Function} iteratee The iteratee invoked per element.
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* @param {boolean} [retHighest] Specify returning the highest qualified index.
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* @returns {number} Returns the index at which `value` should be inserted
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* into `array`.
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*/
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function baseSortedIndexBy(array, value, iteratee, retHighest) {
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var low = 0,
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high = array == null ? 0 : array.length;
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if (high === 0) {
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return 0;
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}
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value = iteratee(value);
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var valIsNaN = value !== value,
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valIsNull = value === null,
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valIsSymbol = isSymbol(value),
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valIsUndefined = value === undefined;
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while (low < high) {
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var mid = nativeFloor((low + high) / 2),
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computed = iteratee(array[mid]),
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othIsDefined = computed !== undefined,
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othIsNull = computed === null,
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othIsReflexive = computed === computed,
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othIsSymbol = isSymbol(computed);
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if (valIsNaN) {
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var setLow = retHighest || othIsReflexive;
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} else if (valIsUndefined) {
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setLow = othIsReflexive && (retHighest || othIsDefined);
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} else if (valIsNull) {
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setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
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} else if (valIsSymbol) {
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setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
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} else if (othIsNull || othIsSymbol) {
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setLow = false;
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} else {
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setLow = retHighest ? (computed <= value) : (computed < value);
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}
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if (setLow) {
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low = mid + 1;
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} else {
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high = mid;
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}
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}
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return nativeMin(high, MAX_ARRAY_INDEX);
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}
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module.exports = baseSortedIndexBy;
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