1 files changed, 38 insertions, 0 deletions
diff --git a/node_modules/core-js/modules/esnext.array.unique-by.js b/node_modules/core-js/modules/esnext.array.unique-by.js
new file mode 100644
index 0000000..c7d1bf6
--- /dev/null
+++ b/node_modules/core-js/modules/esnext.array.unique-by.js
@@ -0,0 +1,38 @@
+'use strict';
+var $ = require('../internals/export');
+var toLength = require('../internals/to-length');
+var toObject = require('../internals/to-object');
+var getBuiltIn = require('../internals/get-built-in');
+var arraySpeciesCreate = require('../internals/array-species-create');
+var addToUnscopables = require('../internals/add-to-unscopables');
+
+var push = [].push;
+
+// `Array.prototype.uniqueBy` method
+// https://github.com/tc39/proposal-array-unique
+$({ target: 'Array', proto: true }, {
+  uniqueBy: function uniqueBy(resolver) {
+    var that = toObject(this);
+    var length = toLength(that.length);
+    var result = arraySpeciesCreate(that, 0);
+    var Map = getBuiltIn('Map');
+    var map = new Map();
+    var resolverFunction, index, item, key;
+    if (typeof resolver == 'function') resolverFunction = resolver;
+    else if (resolver == null) resolverFunction = function (value) {
+      return value;
+    };
+    else throw new TypeError('Incorrect resolver!');
+    for (index = 0; index < length; index++) {
+      item = that[index];
+      key = resolverFunction(item);
+      if (!map.has(key)) map.set(key, item);
+    }
+    map.forEach(function (value) {
+      push.call(result, value);
+    });
+    return result;
+  }
+});
+
+addToUnscopables('uniqueBy');