This project helps you evaluate the quality of the polyfills in the library purescript-math-es6.
In purescript-math-es6 the functions acosh, asinh, atanh, cbrt,
cosh, expm1, log10, log1p, log2, sign, sinh, and tanh all have
type Number -> Number. For each three versions are provided:
- A native version that uses only the engine (browser or Node) provided version
of the function with no polyfill. E.g.,
acoshNative - A polyfill version that does not use the engine provided version and does not
rely on any ES6 features. E.g.,
acoshPolyfill - A production version that uses the native version where available and falls
back to the polyfill. E.g.,
acosh
This project evaluates the native and polyfill versions of those functions at various values and compares them in a table.
To see tables of comparison values using Node, run npm run test. To see the
tables in a browser, run npm run serve. This project expects to find
purescript-math-es6 in a sibling directory.
Generally, the polyfill quality is high. If a native function returns a
non-finite value (NaN, Infinity, -Infinity) at a tested value then the polyfill
returns the same. For finite values the differences are small, either in
absolute terms if the value is small or in relative terms if the value is large.
Polyfills will often return +0.0 when the native versions return -0.0 and 0.0
when the native version returns 5e-324. However, the polyfill for the function
sign, however, exactly matches.