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Diffstat (limited to '')
-rw-r--r-- | js/src/tests/non262/extensions/regress-363040-01.js | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/js/src/tests/non262/extensions/regress-363040-01.js b/js/src/tests/non262/extensions/regress-363040-01.js new file mode 100644 index 0000000000..f8a382d3be --- /dev/null +++ b/js/src/tests/non262/extensions/regress-363040-01.js @@ -0,0 +1,62 @@ +/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +//----------------------------------------------------------------------------- +var BUGNUMBER = 363040; +var summary = 'Array.prototype.reduce application in continued fraction'; +var actual = ''; +var expect = ''; + + +//----------------------------------------------------------------------------- +test(); +//----------------------------------------------------------------------------- + +function test() +{ + printBugNumber(BUGNUMBER); + printStatus (summary); + +// Print x as a continued fraction in compact abbreviated notation and return +// the convergent [n, d] such that x - (n / d) <= epsilon. + function contfrac(x, epsilon) { + let i = Math.floor(x); + let a = [i]; + x = x - i; + let maxerr = x; + while (maxerr > epsilon) { + x = 1 / x; + i = Math.floor(x); + a.push(i); + x = x - i; + maxerr = x * maxerr / i; + } + print(a); + a.push([1, 0]); + a.reverse(); + return a.reduce(function (x, y) {return [x[0] * y + x[1], x[0]];}); + } + + if (!Array.prototype.reduce) + { + print('Test skipped. Array.prototype.reduce not implemented'); + } + else + { +// Show contfrac in action. + for (num of [Math.PI, Math.sqrt(2), 1 / (Math.sqrt(Math.E) - 1)]) { + print('Continued fractions for', num); + for (eps of [1e-2, 1e-3, 1e-5, 1e-7, 1e-10]) { + let frac = contfrac(num, eps); + let est = frac[0] / frac[1]; + let err = num - est; + print(frac, est, err); + } + print(); + } + } + + reportCompare(expect, actual, summary); +} |