Nodejs Array Unique uniq()

Method Source Code

function uniq(array) {
  const beenSeen = [];//  ww  w . j  a va  2 s  .  c om

  for (let i = 0; i < array.length; i++) {
    if (!(beenSeen.includes(array[i]))) {
      beenSeen.push(array[i]);
    }
  }

  return beenSeen;
}

// console.log(uniq([1, 2, 1, 3, 3]));

Array.prototype.uniq = function() {
  const beenSeen = [];

  for (let i = 0; i < this.length; i++) {
    if (!(beenSeen.includes(this[i]))) {
      beenSeen.push(this[i]);
    }
  }

  return beenSeen;
};

// console.log([1, 2, 1, 3, 3].uniq());

Array.prototype.two_sum = function() {
  const twoSum = [];

  for (let i = 0; i < this.length - 1 ; i++) {
    for (let j = i + 1; j < this.length; j++) {
      if (this[i] + this[j] === 0) {
        twoSum.push([i , j]);
      }
    }
  }
  return twoSum;
};
// console.log([-1, 0, 2, -2, 1].two_sum());

function myTranspose(matrix) {
  const outLength = matrix[0].length;
  const outWidth = matrix.length;
  const outArray = [];
  for (let i = 0; i < outLength; i++) {
    const row = [];
    for (let j = 0; j < outWidth; j++) {
      row.push(matrix[j][i]);
    }
    outArray.push(row);
  }
  return outArray;
}

console.log(myTranspose([
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8]
  ]));

Related

1. uniq()

   Array.prototype.uniq = function() {
     var dups = {},
         cleanArray = [];
         array = this,
         i = 0,
         len = array.length;
     if(this.constructor !== Array) {
       throw new TypeError ('Can only call this method on an array');
     for(i; i < len; i++) {
       if(!dups[array[i]]) {
         cleanArray.push(array[i]);
         dups[array[i]] = true;
     return cleanArray;
   

2. uniq()

   Array.prototype.uniq = function (){
     let result = [];
     for (let i = 0; i < this.length; i++) {
       if (result.includes(this[i])) {
         continue;
       } else {
         result.push(this[i]);
     return result;
   };
   console.log([1, 2, 1, 3, 3].uniq());
   console.log([1, 2, 3, 4].uniq());
   

3. uniq()

   var bubbleSort = function (array)
     var sorted = false;
     while (!sorted)
       sorted = true;
       for (i = 0; i < array.length - 1; i++)
         if (array[i] > array[i + 1])
   ...
   

4. uniq()

   Array.prototype.uniq = function() {
     let i;
     let uniqArr = [];
     for (i = 0; i < this.length; i++) {
       if (!uniqArr.includes(this[i])) {
         uniqArr.push(this[i]);
     return uniqArr;
   ...
   

5. uniq()

   function uniq(array) {
     let newArray = [];
     for (let i = 0; i < array.length; i++) {
       if (!newArray.includes(array[i])) {
         newArray.push(array[i]);
     return newArray;
   Array.prototype.uniq = function () {
     let newArray = [];
     for (let i = 0; i < this.length; i++) {
       if (!newArray.includes(this[i])) {
         newArray.push(this[i]);
     return newArray;
   };
   Array.prototype.twoSum = function () {
     let positions = [];
     for (let i = 0; i < this.length; i++) {
       for (let j = i + 1; j < this.length; j++) {
         if (this[i] + this[j] === 0) {
           positions.push([i, j]);
     return positions;
   };
   function myTranspose (array) {
     let transposed = [];
     for (let i = 0; i < array.length; i++) {
       let row = [];
       for (let j = 0; j < array.length; j++) {
         row.push(array[j][i]);
       transposed.push(row);
     return transposed;
   console.log(myTranspose([
       [0, 1, 2],
       [3, 4, 5],
       [6, 7, 8]
     ]));
   

6. uniq()

   Array.prototype.uniq = function() {
     var uniqArray = [];
     for (var i = 0; i < this.length; i++) {
       if (uniqArray.indexOf(this[i]) === -1) {
         uniqArray.push(this[i]);
     return uniqArray;
   };
   ...
   

7. unique

   Array.prototype.unique =
     function() {
       var a = [];
       var l = this.length;
       for(var i=0; i<l; i++) {
         for(var j=i+1; j<l; j++) {
           if (this[i] === this[j])
             j = ++i;
         a.push(this[i]);
       return a;
     };
   

8. unique

   Array.prototype.unique =
     function() {
       var a = [];
       var l = this.length;
       for(var i=0; i<l; i++) {
         for(var j=i+1; j<l; j++) {
           if (this[i] === this[j])
             j = ++i;
         a.push(this[i]);
       return a;
     };
     Array.prototype.clean = function(deleteValue) {
       for (var i = 0; i < this.length; i++) {
         if (this[i] == deleteValue) {         
           this.splice(i, 1);
           i--;
       return this;
     };  
   String.prototype.contains = function(it) { return this.indexOf(it) != -1; };
   

9. unique

   Array.prototype.unique =
     function() {
       var a = [];
       var l = this.length;
       for(var i=0; i<l; i++) {
         for(var j=i+1; j<l; j++) {
           if (this[i] === this[j])
             j = ++i;
         a.push(this[i]);
       return a;
     };
   Date.prototype.today = function () {
       return ((this.getDate() < 10)?"0":"") + this.getDate() +"."+(((this.getMonth()+1) < 10)?"0":"") + (this.getMonth()+1) +"."+ this.getFullYear();
   Date.prototype.timeNow = function () {
        return ((this.getHours() < 10)?"0":"") + this.getHours() +":"+ ((this.getMinutes() < 10)?"0":"") + this.getMinutes() +":"+ ((this.getSeconds() < 10)?"0":"") + this.getSeconds();