Function countMapBy

Counts the values of an array into a map, with the key being based on a key mapper, and the value being the occurrences of the key mapper result in the initial array.

Since

12.0.0

See

• groupMapBy
• groupMapReducingBy

Returns

Count map.

Example

countMapBy([1, 2, 4, 2, 4, 4], val => val)
// => Map{1: 1, 2: 2, 4: 3}