4-11 diff problems

4-11 diff problems

function scoreHand(cards) {
    var aces = 0;
    var score = cards.reduce(function(sum,card) {
        var value = 10;
        if(card.match(/\d/)) {
            value = parseInt(card);
        } else if(card === "A") {
            value = 11;
            aces++;
        }
        return sum + value;
    }, 0);

    // aces >=0
    // score > 21
    while(score > 21 && aces--) {
        score -= 10;
        // aces --;
    }
    // aces?
    
    return score

}

scoreHand(["5", "4", "3", "2", "A", "K"]);


function missingWords(s, t) {
	
	var missing = [];
	var a = s. split(' ');
	var b = t.split(' ');
	
	for(var i=0, j=0; i < a.length; i++){
		if(a[i] !== b[j]) {
			missing.push(a[i]);
		} else {
			j++;
		}
	}
	
	return missing;
}

missingWords('I am using hackerrank to improve programming', 'am hackerrank to improve')


// method 2
// function missingWords(s, t) {
	
// 	var missing = [];
// 	var a = s. split(' ');
// 	var b = t.split(' ');
	
// 	a.forEach((word, i) => {
// 		if(word !== b[i- missing.length]) {
// 			missing.push(word);
// 		}
// 	});
	
// 	return missing;
// }

// method 3
// function missingWords(x, y) {
// 	var a=x.split(' '), s=y.split(' '), m=[];
// 	for(var i=0;i<a.length;i++)
// 		if(a[i]!==s[i-m.length])
// 			m.push(a[i]);
// 		return m;
// }

// missingWords('I am using hackerrank to improve programming', 'am hackerrank to improve')



function closestNumbers(arr) {
    arr.sort((a,b) => a-b );

    var smallestGap = arr.reduce(function(gap, num , i) {
        var thisGap = arr[i+1] - num;

        return thisGap < gap ? thisGap : gap;
        // num - arr[i+1]
    }, infinity);

    var pairs = [];
    
    arr.forEach(function(num,i) {
        var thisGap = arr[i+1] - num;

        if(thisGap === smallestGap) {
            pairs.push(num, arr[i+1]);
        }
    });

    return pairs.join(' ');
}

closestNumbers([16,3,10,7,13,-4,5])