Cards Frequencies

/* Write a JavaScript function findCardFrequency(str) that that accepts the following parameters:
 string of several cards (face + suit), separated by a space. The function calculates and prints at the console
 the frequency of each card face in format "card_face -> frequency". The frequency is calculated by
 the formula appearances / N and is expressed in percentages with exactly 2 digits after the decimal point.
 The card faces with their frequency should be printed in the order of the card face's first appearance
 in the input. The same card can appear multiple times in the input, but its face should be listed only once
 in the output. Write JS program cardFrequencies.js that invokes your function with the sample input data below
 and prints the output at the console. */

"use strict";

function findCardFrequency(str) {
    var cardFacesArr = str.split(/\W+/).filter(Boolean);
    var cardsFrequencies = {};
    for (var i = 0; i < cardFacesArr.length; i += 1) {
        var card = cardFacesArr[i];
        if (!(cardsFrequencies.hasOwnProperty(card))) {
            cardsFrequencies[card] = 0;
        }
        cardsFrequencies[card]++;
    }

    function calculateCurrentCardFrequencyInPercentages(appearance) {
        var frequency = appearance * 100 / cardFacesArr.length;
        return frequency.toFixed(2);
    }

    for (i = 0; i < cardFacesArr.length; i += 1) {
        card = cardFacesArr[i];
        if (cardsFrequencies.hasOwnProperty(card) && cardsFrequencies[card]) {
            var cardFrequency = calculateCurrentCardFrequencyInPercentages(cardsFrequencies[card]);
            console.log("%s -> %s%", card, cardFrequency);
            cardsFrequencies[card] = false;
        }
    }
}

findCardFrequency('8♥ 2♣ 4♦ 10♦ J♥ A♠ K♦ 10♥ K♠ K♦');
console.log();
findCardFrequency('J♥ 2♣ 2♦ 2♥ 2♦ 2♠ 2♦ J♥ 2♠');
console.log();
findCardFrequency('10♣ 10♥');