@extra-lists/union-keys v2.2.10

Gives keys present in any lists. :package: :smiley_cat: :running: :vhs: :moon: :scroll: :newspaper: :blue_book:

Similar: unionKeys, intersectionKeys.

This is part of package extra-lists.

lists.unionKeys(...xs);
// xs: n lists

const lists = require('extra-lists');

var x = [['a', 'b', 'c', 'd'], [1, 2, 3, 4]];
var y = [['b', 'c', 'e'], [20, 30, 50]];
lists.unionKeys(x, y);
// Set(5) { 'a', 'b', 'c', 'd', 'e' }

References

• Data.Set.union: Haskell
• Set.union: Python
• _.union: lodash
• _.unionBy: lodash
• _.unionWith: lodash
• Array.union: sugarjs