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							74 lines
						
					
					
						
							2.2 KiB
						
					
					
				
			
		
		
	
	
							74 lines
						
					
					
						
							2.2 KiB
						
					
					
				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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 | 
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/* Built-in method references for those with the same name as other `lodash` methods. */ | 
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var nativeMin = Math.min; | 
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 | 
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/** | 
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 * The base implementation of methods like `_.intersection`, without support | 
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 * for iteratee shorthands, that accepts an array of arrays to inspect. | 
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 * | 
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 * @private | 
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 * @param {Array} arrays The arrays 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 array of shared values. | 
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 */ | 
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function baseIntersection(arrays, iteratee, comparator) { | 
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  var includes = comparator ? arrayIncludesWith : arrayIncludes, | 
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      length = arrays[0].length, | 
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      othLength = arrays.length, | 
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      othIndex = othLength, | 
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      caches = Array(othLength), | 
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      maxLength = Infinity, | 
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      result = []; | 
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 | 
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  while (othIndex--) { | 
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    var array = arrays[othIndex]; | 
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    if (othIndex && iteratee) { | 
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      array = arrayMap(array, baseUnary(iteratee)); | 
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    } | 
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    maxLength = nativeMin(array.length, maxLength); | 
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    caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120)) | 
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      ? new SetCache(othIndex && array) | 
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      : undefined; | 
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  } | 
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  array = arrays[0]; | 
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 | 
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  var index = -1, | 
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      seen = caches[0]; | 
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 | 
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  outer: | 
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  while (++index < length && result.length < maxLength) { | 
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    var value = array[index], | 
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        computed = iteratee ? iteratee(value) : value; | 
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 | 
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    value = (comparator || value !== 0) ? value : 0; | 
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    if (!(seen | 
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          ? cacheHas(seen, computed) | 
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          : includes(result, computed, comparator) | 
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        )) { | 
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      othIndex = othLength; | 
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      while (--othIndex) { | 
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        var cache = caches[othIndex]; | 
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        if (!(cache | 
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              ? cacheHas(cache, computed) | 
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              : includes(arrays[othIndex], computed, comparator)) | 
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            ) { | 
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          continue outer; | 
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        } | 
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      } | 
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      if (seen) { | 
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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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 | 
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module.exports = baseIntersection;
 | 
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 |