Bump to v4.1.0.

_baseIntersection.js

@@ -0,0 +1,62 @@
+var SetCache = require('./_SetCache'),
+    arrayIncludes = require('./_arrayIncludes'),
+    arrayIncludesWith = require('./_arrayIncludesWith'),
+    arrayMap = require('./_arrayMap'),
+    baseUnary = require('./_baseUnary'),
+    cacheHas = require('./_cacheHas');
+
+/**
+ * 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,
+      othLength = arrays.length,
+      othIndex = othLength,
+      caches = Array(othLength),
+      result = [];
+
+  while (othIndex--) {
+    var array = arrays[othIndex];
+    if (othIndex && iteratee) {
+      array = arrayMap(array, baseUnary(iteratee));
+    }
+    caches[othIndex] = !comparator && (iteratee || array.length >= 120)
+      ? new SetCache(othIndex && array)
+      : undefined;
+  }
+  array = arrays[0];
+
+  var index = -1,
+      length = array.length,
+      seen = caches[0];
+
+  outer:
+  while (++index < length) {
+    var value = array[index],
+        computed = iteratee ? iteratee(value) : value;
+
+    if (!(seen ? cacheHas(seen, computed) : includes(result, computed, comparator))) {
+      var 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;