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// Copyright (C) 2016 The V8 Project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 18.2.3
esid: sec-isnan-number
description: >
Throws a TypeError if number.@@toPrimitive is not null, undefined, or callable
info: |
isNaN (number)
1. Let num be ? ToNumber(number).
ToPrimitive ( input [ , PreferredType ] )
[...]
4. Let exoticToPrim be ? GetMethod(input, @@toPrimitive).
GetMethod (V, P)
[...]
2. Let func be ? GetV(V, P).
3. If func is either undefined or null, return undefined.
4. If IsCallable(func) is false, throw a TypeError exception.
features: [Symbol.toPrimitive]
---*/
var obj = {};
obj[Symbol.toPrimitive] = 42;
assert.throws(TypeError, function() {
isNaN(obj);
}, "number");
obj[Symbol.toPrimitive] = "";
assert.throws(TypeError, function() {
isNaN(obj);
}, "string");
obj[Symbol.toPrimitive] = true;
assert.throws(TypeError, function() {
isNaN(obj);
}, "boolean");
obj[Symbol.toPrimitive] = Symbol.toPrimitive;
assert.throws(TypeError, function() {
isNaN(obj);
}, "symbol");
obj[Symbol.toPrimitive] = {};
assert.throws(TypeError, function() {
isNaN(obj);
}, "object");
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