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 p_zero = 0.0; 16var n_zero = -p_zero; 17 18function isSameZero (x, y) 19{ 20 return x === 0 && (1 / x) === (1 / y); 21} 22 23assert(isNaN(Math.log1p(NaN))); 24assert(isNaN(Math.log1p(-42))); 25assert(isNaN(Math.log1p(-3.0))); 26assert(isSameZero(Math.log1p(n_zero), n_zero)); 27assert(isSameZero(Math.log1p(p_zero), p_zero)); 28assert(Math.log1p(-1) === Number.NEGATIVE_INFINITY); 29assert(Math.log1p(Number.POSITIVE_INFINITY) === Number.POSITIVE_INFINITY); 30assert(Math.log1p(Math.E - 1) === 1); 31