count

Counts values which satisfy a test. 🏃 📼 📦 🌔 📒

Alternatives: [count], [countAs].

entries.count(x, fn);
// x:  a map
// fn: test function (v, k, x)

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

var x = new Map([['a', 1], ['b', 1], ['c', 2], ['d', 2], ['e', 4]]);
map.count(x, v => v % 2 === 1);
// 2

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

references

• List-Extra.count: elm
• _.countBy: lodash
• Array.count: sugarjs
• count-iterable-values: @zeke