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