Function fromKeys

SortedSet.fromKeys() creates a new immutable SortedSet containing the keys from this Collection or JavaScript Object.

> const { SortedMap, Map } = require('@oraichain/immutable');

> let map=Map({x:'X', c:'B', m:'M', anylabel:'K', f:'F'});
> let sortedSet=SortedSet.fromKeys(map);
SortedSet { "anylabel", "c", "f", "m", "x" }

> sortedSet=SortedSet.fromKeys({x:'X', c:'B', m:'M', anylabel:'K', f:'F'});
SortedSet { "anylabel", "c", "f", "m", "x" }
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