count

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Subhajit Sahu edited this page Dec 22, 2022 · 14 revisions

Count values which satisfy a test.

Alternatives: count, countAs.

function count(x, ft)
// x:  entries
// ft: test function (v, k, x)

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

var x = [["a", 1], ["b", 1], ["c", 2], ["d", 2], ["e", 4]];
entries.count(x, v => v % 2 === 1);
// → 2

entries.count(x, v => v % 2 === 0);
// → 3

References