--- /dev/null
+// 26.1.2 Reflect.construct(target, argumentsList [, newTarget])
+var $export = require('./_export')
+ , create = require('./_object-create')
+ , aFunction = require('./_a-function')
+ , anObject = require('./_an-object')
+ , isObject = require('./_is-object')
+ , fails = require('./_fails')
+ , bind = require('./_bind')
+ , rConstruct = (require('./_global').Reflect || {}).construct;
+
+// MS Edge supports only 2 arguments and argumentsList argument is optional
+// FF Nightly sets third argument as `new.target`, but does not create `this` from it
+var NEW_TARGET_BUG = fails(function(){
+ function F(){}
+ return !(rConstruct(function(){}, [], F) instanceof F);
+});
+var ARGS_BUG = !fails(function(){
+ rConstruct(function(){});
+});
+
+$export($export.S + $export.F * (NEW_TARGET_BUG || ARGS_BUG), 'Reflect', {
+ construct: function construct(Target, args /*, newTarget*/){
+ aFunction(Target);
+ anObject(args);
+ var newTarget = arguments.length < 3 ? Target : aFunction(arguments[2]);
+ if(ARGS_BUG && !NEW_TARGET_BUG)return rConstruct(Target, args, newTarget);
+ if(Target == newTarget){
+ // w/o altered newTarget, optimization for 0-4 arguments
+ switch(args.length){
+ case 0: return new Target;
+ case 1: return new Target(args[0]);
+ case 2: return new Target(args[0], args[1]);
+ case 3: return new Target(args[0], args[1], args[2]);
+ case 4: return new Target(args[0], args[1], args[2], args[3]);
+ }
+ // w/o altered newTarget, lot of arguments case
+ var $args = [null];
+ $args.push.apply($args, args);
+ return new (bind.apply(Target, $args));
+ }
+ // with altered newTarget, not support built-in constructors
+ var proto = newTarget.prototype
+ , instance = create(isObject(proto) ? proto : Object.prototype)
+ , result = Function.apply.call(Target, instance, args);
+ return isObject(result) ? result : instance;
+ }
+});
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