--- /dev/null
+// 7.1.1 ToPrimitive(input [, PreferredType])
+var isObject = require('./_is-object');
+// instead of the ES6 spec version, we didn't implement @@toPrimitive case
+// and the second argument - flag - preferred type is a string
+module.exports = function(it, S){
+ if(!isObject(it))return it;
+ var fn, val;
+ if(S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it)))return val;
+ if(typeof (fn = it.valueOf) == 'function' && !isObject(val = fn.call(it)))return val;
+ if(!S && typeof (fn = it.toString) == 'function' && !isObject(val = fn.call(it)))return val;
+ throw TypeError("Can't convert object to primitive value");
+};
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