'use strict'; 
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var $ = require('../internals/export'); 
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var getBuiltIn = require('../internals/get-built-in'); 
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var uncurryThis = require('../internals/function-uncurry-this'); 
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var aCallable = require('../internals/a-callable'); 
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var requireObjectCoercible = require('../internals/require-object-coercible'); 
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var toPropertyKey = require('../internals/to-property-key'); 
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var iterate = require('../internals/iterate'); 
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var fails = require('../internals/fails'); 
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// eslint-disable-next-line es/no-object-groupby -- testing 
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var nativeGroupBy = Object.groupBy; 
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var create = getBuiltIn('Object', 'create'); 
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var push = uncurryThis([].push); 
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var DOES_NOT_WORK_WITH_PRIMITIVES = !nativeGroupBy || fails(function () { 
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  return nativeGroupBy('ab', function (it) { 
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    return it; 
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  }).a.length !== 1; 
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}); 
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// `Object.groupBy` method 
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// https://tc39.es/ecma262/#sec-object.groupby 
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$({ target: 'Object', stat: true, forced: DOES_NOT_WORK_WITH_PRIMITIVES }, { 
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  groupBy: function groupBy(items, callbackfn) { 
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    requireObjectCoercible(items); 
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    aCallable(callbackfn); 
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    var obj = create(null); 
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    var k = 0; 
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    iterate(items, function (value) { 
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      var key = toPropertyKey(callbackfn(value, k++)); 
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      // in some IE versions, `hasOwnProperty` returns incorrect result on integer keys 
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      // but since it's a `null` prototype object, we can safely use `in` 
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      if (key in obj) push(obj[key], value); 
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      else obj[key] = [value]; 
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    }); 
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    return obj; 
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  } 
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}); 
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