v8/test/mjsunit/abs.js

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// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Test Math.sin and Math.abs.
assertEquals(1, Math.abs(1)); // Positive SMI.
assertEquals(1, Math.abs(-1)); // Negative SMI.
assertEquals(0.5, Math.abs(0.5)); // Positive double.
assertEquals(0.5, Math.abs(-0.5)); // Negative double.
assertEquals('Infinity', Math.abs(Number('+Infinity').toString()));
assertEquals('Infinity', Math.abs(Number('-Infinity').toString()));
assertEquals('NaN', Math.abs(NaN).toString());
assertEquals('NaN', Math.abs(-NaN).toString());
var minusZero = 1 / (-1 / 0);
function isMinusZero(x) {
return x === 0 && 1 / x < 0;
}
assertTrue(!isMinusZero(0));
assertTrue(isMinusZero(minusZero));
assertEquals(0, Math.abs(minusZero));
assertTrue(!isMinusZero(Math.abs(minusZero)));
assertTrue(!isMinusZero(Math.abs(0.0)));