1// Copyright JS Foundation and other contributors, http://js.foundation
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15var nan = NaN;
16var p_zero = 0.0;
17var m_zero = -p_zero;
18
19function isSameZero (x, y)
20{
21  return x === 0 && (1 / x) === (1 / y);
22}
23
24assert(isNaN(Math.atanh(NaN)));
25assert(isNaN(Math.atanh(2)));
26assert(isNaN(Math.atanh(44)));
27assert(isNaN(Math.atanh(-2)));
28assert(isNaN(Math.atanh(-13)));
29assert(isSameZero(Math.atanh(p_zero), p_zero));
30assert(isSameZero(Math.atanh(m_zero), m_zero));
31assert(Math.atanh(-1) === Number.NEGATIVE_INFINITY);
32assert(Math.atanh(1) === Number.POSITIVE_INFINITY);
33