react app

react-app/node_modules/lodash/array/intersection.js

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+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;