union

Obtain entries present in any lists.

Similar: union, intersection, difference, symmetricDifference, isDisjoint.

function union(x, y, fc)
// x:  lists
// y:  another lists
// fc: combine function (a, b)

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

var x = [['a', 'b', 'c'], [1, 2, 3]];
var y = [['b', 'c', 'd'], [20, 30, 40]];
xlists.union(x, y).map(v => [...v]);
// → [ [ 'a', 'b', 'c', 'd' ], [ 1, 2, 3, 40 ] ]

xlists.union(x, y, (a, b) => b).map(v => [...v]);
// → [ [ 'a', 'b', 'c', 'd' ], [ 1, 20, 30, 40 ] ]

References

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