randomSubset - nodef/extra-lists GitHub Wiki
Pick an arbitrary subset.
Similar: randomSubset, subsets, isSubset.
function randomSubset(x, n, fr)
// x: lists
// n: number of entries [-1 ⇒ any]
// fr: random number generator ([0, 1))
const xlists = require('extra-lists');
var x = ['a', 'b', 'c', 'd'], [1, 2, 3, 4](/nodef/extra-lists/wiki/'a',-'b',-'c',-'d'],-[1,-2,-3,-4);
xlists.randomSubset(x).map(c => [...c]);
// → [ [ 'b', 'c' ], [ 2, 3 ] ]
xlists.randomSubset(x, 3).map(c => [...c]);
// → [ [ 'a', 'b', 'd' ], [ 1, 2, 4 ] ]
xlists.randomSubset(x, 2).map(c => [...c]);
// → [ [ 'b', 'd' ], [ 2, 4 ] ]