es6-math

A polyfill for ES6 mathematical and helper functions and constants.

Installation

As a standalone Javascript file (not needed when using AMD loaders like Require.js):

<script type="text/javascript" src="es6-math.js"></script>

A minified version (es6-math.min.js) is provided too, along with its source map.

When using an AMD loader (like RequireJS in this example), you should require the module at the beginning like this:

require(["es6-math"], function() {
    ...
});

The module doesn't return anything, as it's a polyfill for functions defined on the Math and Number global objects.

To avoid unnecessary loading, it's recommended to check the existence of Math.sinh and/or any other Ecmascript-6 mathematical functions prior to requiring the module.

Usage

Once the script has been loaded, you're ready to use the ES6 mathematical and helper functions:

• Math.sinh
• Math.cosh
• Math.tanh
• Math.asinh
• Math.acosh
• Math.atanh
• Math.expm1
• Math.log1p
• Math.log2
• Math.log10
• Math.sign
• Math.cbrt
• Math.hypot
• Math.trunc
• Math.fround
• Math.clz32
• Math.imul
• Number.isNaN
• Number.isFinite
• Number.isInteger
• Number.isSafeInteger
• Number.parseFloat
• Number.parseInt

And the new Number constants:

• Number.EPSILON
• Number.MAX_SAFE_INTEGER
• Number.MIN_SAFE_INTEGER

Notes

On Number three new constants are defined:

• EPSILON => 2.220446049250313e-16
• MAX_SAFE_INTEGER => 9007199254740991
• MIN_SAFE_INTEGER => -9007199254740991

Where Object.defineProperty isn't supported (IE7-, for example) or it can't be used on plain objects (IE8), the values are defined as common properties and thus they can be overwritten. This can't be avoided.

Some functions may not be as precise as you expect. This usually happens with large arguments, and depends on the formulae used to compute the result. For example, Math.asinh starts returning Infinity as soon as 1.3407807929942597e+154, whereas Firefox returns finite values up to 1.7976931348623157e+308 (i.e. Number.MAX_VALUE). As of version 38, Chrome isn't as good, though.

Math.fround

This function is correctly polyfilled on platforms that support typed arrays (as Float32Array). On other environments, it's just the identity function.

An exact, pure Javascript polyfill could have been provided, but that would have defied the purpose of Math.fround, which is to provide fast values to work with. A Javascript polyfill would have been way slower, and even the one using a typed array is 10x-12x slower than a native implementation (tested on Chrome and Firefox).

Moreover, older versions of Safari (6.x) are very slow with typed arrays, so the polyfill could be quite detrimental on performances.

Tests

The unit tests are built on top of mocha. Once the package is installed, run npm install from the package's root directory in order to locally install mocha, then npm run test to execute the tests. Open index.html with a browser to perform the tests on the client side.

If mocha is installed globally, served side tests can be run with just the command mocha from the package's root directory.

License

The MIT License (MIT)

Copyright (c) 2014-2015 Massimo Artizzu (MaxArt2501)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.