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countAs

Subhajit Sahu edited this page Dec 8, 2022 · 13 revisions

Count occurrences of values.

Similar: count, countAs.


function countAs(x, fm)
// x:  an object
// fm: map function (v, k, x)
const object = require('extra-object');

var x = {a: 1, b: 1, c: 2, d: 2, e: 4};
object.countAs(x);
// → Map(3) { 1 => 2, 2 => 2, 4 => 1 }

var x = {a: 1, b: 2, c: 3, d: 4};
object.countAs(x, v => v % 2);
// → Map(2) { 1 => 2, 0 => 2 }


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