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72 lines
1.9 KiB
72 lines
1.9 KiB
import SetCache from './_SetCache.js'; |
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import arrayIncludes from './_arrayIncludes.js'; |
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import arrayIncludesWith from './_arrayIncludesWith.js'; |
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import cacheHas from './_cacheHas.js'; |
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import createSet from './_createSet.js'; |
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import setToArray from './_setToArray.js'; |
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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 `_.uniqBy` without support for 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 {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 duplicate free array. |
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*/ |
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function baseUniq(array, iteratee, comparator) { |
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var index = -1, |
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includes = arrayIncludes, |
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length = array.length, |
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isCommon = true, |
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result = [], |
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seen = result; |
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if (comparator) { |
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isCommon = false; |
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includes = arrayIncludesWith; |
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} |
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else if (length >= LARGE_ARRAY_SIZE) { |
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var set = iteratee ? null : createSet(array); |
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if (set) { |
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return setToArray(set); |
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} |
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isCommon = false; |
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includes = cacheHas; |
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seen = new SetCache; |
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} |
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else { |
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seen = iteratee ? [] : result; |
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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 ? iteratee(value) : value; |
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value = (comparator || value !== 0) ? value : 0; |
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if (isCommon && computed === computed) { |
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var seenIndex = seen.length; |
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while (seenIndex--) { |
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if (seen[seenIndex] === computed) { |
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continue outer; |
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} |
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} |
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if (iteratee) { |
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seen.push(computed); |
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} |
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result.push(value); |
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} |
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else if (!includes(seen, computed, comparator)) { |
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if (seen !== result) { |
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seen.push(computed); |
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} |
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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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export default baseUniq;
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