Allows to sort an array by frequency of occurence in JS

Sorting an array by frequency of occurence.js

const arr = [1, 2, 4, 5, 5, 5, 2, 4, 3, 4, 3, 3, 2, 3, 2, 1, 1, 2, 1]

Array.prototype.sortByFrequency = function () {
	let frequency = {}
	let sorting = []
	let new_arr = []

	this.forEach(value => frequency[value] = (frequency[value] || 0) + 1)

	for (let key in frequency)sorting = [...sorting, [key, frequency[key]]]
	sorting.sort((a, b) => b[1] - a[1])

	sorting.forEach(element => {
		this.forEach(arr_element => {
			if (arr_element.toString() === element[0])
				new_arr = [...new_arr, arr_element]
		})
	})

	return new_arr
}

arr.sortByFrequency()
// OUTPUT: [ 2, 2, 2, 2, 2, 1, 1, 1, 1, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5 ]

Sorting an array of objects by frequency of occurence.js

const arr =	[
	{ name: "John",		score: 34 },
	{ name: "Lou", 		score: 12 },
	{ name: "George", 	score: 28 },
	{ name: "Mike", 	score: 34 },
	{ name: "Steve", 	score: 34 },
	{ name: "Sophie", 	score: 9  },
	{ name: "Emma", 	score: 12 },
	{ name: "John", 	score: 17 }]

Array.prototype.sortByFrequencyOf = function (attribute) {
	if (!attribute) return []

	let frequency = {}
	let sorting = []
	let new_arr = []

	this.forEach(value => frequency[value[attribute]] = (frequency[value[attribute]] || 0) + 1)

	for (let key in frequency)sorting = [...sorting, [key, frequency[key]]]
	sorting.sort((a, b) => b[1] - a[1])

	sorting.forEach(element => {
		this.forEach(arr_element => {
			if (arr_element[attribute].toString() === element[0])
				new_arr = [...new_arr, arr_element]
		})
	})

	return new_arr
}

arr.sortByFrequencyOf('score')
/* OUTPUT:
[{ name: 'John', score: 34 },
{ name: 'Mike', score: 34 },
{ name: 'Steve', score: 34 },
{ name: 'Lou', score: 12 },
{ name: 'Emma', score: 12 },
{ name: 'Sophie', score: 9 },
{ name: 'John', score: 17 },
{ name: 'George', score: 28 }] */