counting

Creates an object with counts of occurrences of items

Usage

Given an array of objects and an identity callback function to determine how each object should be identified. Returns an object where the keys are the id values the callback returned and each value is an integer telling how many times that id occurred.

import * as 
import _
_ from 'radashi'

const 
const gods: {
    name: string;
    culture: string;
}[]
gods = [
  {
    
name: string
name: 'Ra',
    
culture: string
culture: 'egypt',
  },
  {
    
name: string
name: 'Zeus',
    
culture: string
culture: 'greek',
  },
  {
    
name: string
name: 'Loki',
    
culture: string
culture: 'greek',
  },
]

const 
const countingByCulture: Record<string, number>
countingByCulture = 
import _
_.
counting<{
    name: string;
    culture: string;
}, string>(array: readonly {
    name: string;
    culture: string;
}[], identity: (item: {
    name: string;
    culture: string;
}) => string): Record<string, number>
export counting
Counts the occurrences of each unique value returned by the identity
function when applied to each item in the array.
@see ― https://radashi.js.org/reference/array/counting
@example 
counting([1, 2, 3, 4], (n) => n % 2 === 0 ? 'even' : 'odd')
// { even: 2, odd: 2 }
@version ― 12.1.0
counting(
const gods: {
    name: string;
    culture: string;
}[]
gods, 
g: {
    name: string;
    culture: string;
}
g => 
g: {
    name: string;
    culture: string;
}
g.
culture: string
culture) // => { egypt: 1, greek: 2 }