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frontend/node_modules/core-js-pure/internals/collection-of.js

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+'use strict';
+var anObject = require('../internals/an-object');
+
+// https://tc39.github.io/proposal-setmap-offrom/
+module.exports = function (C, adder, ENTRY) {
+  return function of() {
+    var result = new C();
+    var length = arguments.length;
+    for (var index = 0; index < length; index++) {
+      var entry = arguments[index];
+      if (ENTRY) adder(result, anObject(entry)[0], entry[1]);
+      else adder(result, entry);
+    } return result;
+  };
+};