count

Count values which satisfy a test.

Similar: count, countAs.

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

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

var x = {a: 1, b: 1, c: 2, d: 2, e: 4};
object.count(x, v => v % 2 === 1);
// → 2

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

References

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