randomSubset

Pick an arbitrary subset.

Similar: randomSubset, subsets, hasSubset.

function randomSubset(x, n, fr)
// x:  ientries
// n:  number of ientries [-1 ⇒ any]
// fr: random number generator ([0, 1))

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

var x = [["a", 1], ["b", 2], ["c", 3], ["d", 4]];
[...ientries.randomSubset(x)];
// → [ [ "a", 1 ], [ "d", 4 ] ]

[...ientries.randomSubset(x, 3)];
// → [ [ "a", 1 ], [ "b", 2 ], [ "d", 4 ] ]

[...ientries.randomSubset(x, 2)];
// → [ [ "b", 2 ], [ "d", 4 ] ]

References

• shuffle: PHP
• shuffle-seed: @webcaetano
• shuffle-array: @pazguille
• Seeding the random number generator in Javascript