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Contents
var baseIndexOf = require('../internal/baseIndexOf'),
cacheIndexOf = require('../internal/cacheIndexOf'),
createCache = require('../internal/createCache'),
isArrayLike = require('../internal/isArrayLike'),
restParam = require('../function/restParam');
/**
* Creates an array of unique values that are included in all of the provided
* arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
* for equality comparisons.
*
* @static
* @memberOf _
* @category Array
* @param {...Array} [arrays] The arrays to inspect.
* @returns {Array} Returns the new array of shared values.
* @example
* _.intersection([1, 2], [4, 2], [2, 1]);
* // => [2]
*/
var intersection = restParam(function(arrays) {
var othLength = arrays.length,
othIndex = othLength,
caches = Array(length),
indexOf = baseIndexOf,
isCommon = true,
result = [];
while (othIndex--) {
var value = arrays[othIndex] = isArrayLike(value = arrays[othIndex]) ? value : [];
caches[othIndex] = (isCommon && value.length >= 120) ? createCache(othIndex && value) : null;
}
var array = arrays[0],
index = -1,
length = array ? array.length : 0,
seen = caches[0];
outer:
while (++index < length) {
value = array[index];
if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value, 0)) < 0) {
var othIndex = othLength;
while (--othIndex) {
var cache = caches[othIndex];
if ((cache ? cacheIndexOf(cache, value) : indexOf(arrays[othIndex], value, 0)) < 0) {
continue outer;
}
}
if (seen) {
seen.push(value);
}
result.push(value);
}
}
return result;
});
module.exports = intersection;
Version data entries
153 entries across 80 versions & 8 rubygems