Vigowebs

function removeDuplicate(arr) {
	return arr.filter((element, index, array) => array.indexOf(element) === index);
}

Vigowebs

function removeDuplicate(arr) {
	return Array.from(new Set(arr))
}

Vigowebs

function reverse(str){
  var rtnStr = [];
  if(!str || typeof str != 'string' || str.length < 2 ) return str;
  
  for(var i = str.length-1; i>=0;i--){
    rtnStr.push(str[i]);
  }
  return rtnStr.join('');
}

Vigowebs

function reverse (str) {
    if (str === "") {
        return "";
    } else {
        return reverse(str.substr(1)) + str.charAt(0);
    }
}

Vigowebs

function missingNumber(arr){
  var n = arr.length+1, 
  sum = 0,
  expectedSum = n* (n+1)/2;
  
  sum = arr.reduce((total, num) => total + num);
  return expectedSum - sum;
}

missingNumber([5, 2, 6, 1, 3]);

Vigowebs

function permut(string) {
    if (string.length < 2) return string; // This is our break condition

    var permutations = []; // This array will hold our permutations

    for (var i=0; i<string.length; i++) {
        var char = string[i];

        // Cause we don't want any duplicates:
        if (string.indexOf(char) != i) // if char was used already

Vigowebs

function sumFinder(arr, sum){
  var len = arr.length;
  
  for(var i =0; i<len-1; i++){  
     for(var j = i+1;j<len; j++){
        if (arr[i] + arr[j] == sum)
            return true;
     }
  }
  return false;

Vigowebs

function sumFinder(arr, sum){
  var differ = {}, 
      len = arr.length,
      substract;
  
  for(var i =0; i<len; i++){
     substract = sum - arr[i];

     if(differ[substract])
       return true;       

Vigowebs

function isBalanced(str) {
  var i, ch;

  var bracketsMap = new Map();
  bracketsMap.set(']', '[');
  bracketsMap.set('}', '{');
  bracketsMap.set(')', '(');

  // Use the spread operator to transform a map into a 2D key-value Array.
  var closingBrackets = [...bracketsMap.keys()];

Vigowebs

// ❌
asyncFunc1((err, result1) => {
  asyncFunc2(result1, (err, result2) => {
    asyncFunc3(result2, (err, result3) => {
      console.log(result3)
    })
  })
})

// ✔️