vlas-ilya

change n | n < minimum coins = [[]] 
         | otherwise = [xs | x <- coins, 
                             x <= n, 
                             xs <- map (\ys -> x:ys) $ change (n - x), 
                             sum xs == n]

vlas-ilya

var clockAngle = function (h, m) {
	return Math.abs((h * 30 + m * 0.5) - (m * 6)); 
}

vlas-ilya

var checkPhoneNumberFormat = function (phone) {
	return /^[ ()\-0-9]+$/.test(str);
}

vlas-ilya

var checkAnagram = function(word1, word2) {
	if (word1 == "" || word2 == "") return false;
	word1 = word1.split('').sort();
	word2 = word2.split('').sort();
	if (word1.length != word2.length) {
		return false;
	}
	for (var i = 0; i < word1.length; i++) {
		if (word1[i] != word2[i]) {
			return false;

vlas-ilya

var isCorrectParentheses = function (str) {
	var i = 0;
	for (var ch = 0; ch < str.length; ch++) {
		if (str[ch] === '(') i++;
		if (str[ch] === ')') i--;
		if (i < 0) return false;
	}
	if (i !== 0) return false;
	return true;
}

vlas-ilya

var moveZerosTest = function (arr) {
	var arr2 = []
	var zeroCount = 0;
	var counter = 0;
	for (var i = 0; i < arr.length; i++) {
		if (arr[i] === 0) {
			zeroCount += 1;
		} else {
			arr2[counter] = arr[i];
			counter++;

vlas-ilya

var isValidCreditCard = function (xs) {
  return xs.split('').reverse().map(function (elem, index, xs) {
      return index % 2 ? (2 * elem < 9 ? 2 * elem : 2 * elem - 9) : Number(elem);
    }).reduce(function(sum, elem) { return sum + elem }) % 10 == 0;
}

vlas-ilya

var difference = function (x) {
  var sumSq = 0,
      sqSum = 0;
  for (var i = 1; i <= x; i++) {
    sumSq += i * i;
    sqSum += i
  }
  return sqSum * sqSum - sumSq
}

vlas-ilya

var transpose = function (matrix) {
  var result = [];
  for (var i = 0; i < matrix.length; i++) {
    for (var j = 0; j < matrix[i].length; j++) {
      if (result[j] == undefined) result[j] = [];
      result[j][i] = matrix[i][j];
    }
  }
  return result
}

vlas-ilya

var isPrime = function (n) {
  for (var i = 2; i < n; i++) {
    if (n % i == 0) {
      return false;
    }
  }
  return true;
}
var sumPrimes = function (x) {
  var result = 0;