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68 lines
1.9 KiB
JavaScript
68 lines
1.9 KiB
JavaScript
var SetCache = require('./_SetCache'),
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arrayIncludes = require('./_arrayIncludes'),
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arrayIncludesWith = require('./_arrayIncludesWith'),
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arrayMap = require('./_arrayMap'),
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baseUnary = require('./_baseUnary'),
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cacheHas = require('./_cacheHas');
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/** Used as the size to enable large array optimizations. */
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var LARGE_ARRAY_SIZE = 200;
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/**
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* The base implementation of methods like `_.difference` without support
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* for excluding multiple arrays or iteratee shorthands.
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*
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* @private
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* @param {Array} array The array to inspect.
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* @param {Array} values The values to exclude.
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* @param {Function} [iteratee] The iteratee invoked per element.
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* @param {Function} [comparator] The comparator invoked per element.
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* @returns {Array} Returns the new array of filtered values.
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*/
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function baseDifference(array, values, iteratee, comparator) {
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var index = -1,
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includes = arrayIncludes,
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isCommon = true,
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length = array.length,
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result = [],
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valuesLength = values.length;
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if (!length) {
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return result;
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}
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if (iteratee) {
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values = arrayMap(values, baseUnary(iteratee));
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}
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if (comparator) {
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includes = arrayIncludesWith;
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isCommon = false;
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}
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else if (values.length >= LARGE_ARRAY_SIZE) {
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includes = cacheHas;
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isCommon = false;
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values = new SetCache(values);
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}
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outer:
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while (++index < length) {
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var value = array[index],
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computed = iteratee == null ? value : iteratee(value);
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value = (comparator || value !== 0) ? value : 0;
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if (isCommon && computed === computed) {
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var valuesIndex = valuesLength;
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while (valuesIndex--) {
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if (values[valuesIndex] === computed) {
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continue outer;
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}
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}
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result.push(value);
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}
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else if (!includes(values, computed, comparator)) {
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result.push(value);
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}
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}
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return result;
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}
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module.exports = baseDifference;
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