PokerChallenge.js

var _ = require('lodash');
var hand = []
var input = [process.argv[2], process.argv[3], process.argv[4], process.argv[5], process.argv[6]]
var isSuited
var isStraight
var sortedHand = []
var cardOrder = ['A', '2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K']


var analyzeHand = function() {
    input.forEach(function(card, i, array) {
    var card = {
        rank: input[i].slice(0,-1),
        suit: input[i].slice(-1)
    }
        hand.push(card)
    })
    checkSuit()
    sortHand()
    checkStraight()
    checkOther()
    handStrength()
}

    function checkSuit() {
        isSuited = hand.every(function(card){
            return hand[0].suit == card.suit
        })
        return isSuited
    }

    function sortHand() {
        var temp = []
        if (_.indexOf(_.map(hand,'rank'), '2') < 0)
            cardOrder.push(cardOrder.shift())
        _.forEach(hand, function(value, key) {
            var i = _.indexOf(cardOrder, value.rank)
            temp[i] = value
        })
        sortedHand = _.compact(temp)

    }
    function checkStraight() {
        isStraight = true
        for (var i = 0; i < sortedHand.length -1; i++) {
            var j = i+1
            if (_.indexOf(cardOrder, sortedHand[i].rank) != _.indexOf(cardOrder, sortedHand[j].rank) -1)
                return isStraight = false
        }
    }
    function checkOther() {
        var groups = []
        var temp = _.groupBy(hand, 'rank')
        _.forEach(temp, function(value){
            if (value.length > 1)
                groups.push(value.length)
        })
        console.log(groups)
        if (_.isMatch(groups, [4]))
            console.log("Four of a kind!")
        else if (_.isMatch(groups, [2,3]))
            console.log('Full house!')
        else if (_.isMatch(groups, [3]))
            console.log('Three of a kind!')
        else if (_.isMatch(groups, [2,2]))
            console.log('Two pair!')
        else if (_.isMatch(groups, [2]))
            console.log('One pair!')
        else
            console.log('High card!')
    }
    function handStrength() {
        if (isStraight && isSuited)
            if (sortedHand[4] == 'A' && sortedHand[3] == 'K')
                console.log('Royal flush!')
            else
                console.log('Straight flush!')
        else if (isSuited)
                console.log('Flush!')
        else if (isStraight)
                console.log('Straight!')

    }
analyzeHand()