ramda-polyfill 
ramda.js Object prototype polyfill library.
It inserts ramda functions to Object's prototype. Maybe not suitable for production.
So what you can do with this is
function getAccessibleVisibleFramesSizeDesc(win) {
return win
.mapR(w => w) // .toArray()
// for ease of processing recursive frame.
.unfoldR(([frame = null, ...rest]) => {
if (!frame) return false;
try { // for CORS blocked exception.
return [
$(frame.frameElement).is(':visible') ? frame : null,
rest.concat(R.map(w => w, frame))
];
} catch (e) {
return [null, rest];
}
})
.filter(w => w) // filter out blocked or invisible frame.
// size descending sort.
.sortByR(({ frameElement: x }) => -x.clientWidth * x.clientHeight)
.prependR(win); // include itself.
}See test/test.js for more examples.
Precautions
- Due to name collision, 'R' is appended to name. e.g.
anyR - It uses 'this' as last regular argument.
- Unary function is evaluated without call parenthesis.
- It imports side effects by default and can toggle features by specific function.