count

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Subhajit Sahu edited this page Dec 2, 2022 · 17 revisions

Count values which satisfy a test.

Alternatives: count, countAs.

function count(x, ft)
// x:  a set
// ft: test function (v, v, x)

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

var x = new Set([1, 2, 3, 4, 5]);
set.count(x, v => v % 2 === 1);
// → 3

set.count(x, v => v % 2 === 0);
// → 2

References