Nodejs Array Multiply multiples(multiple)

Method Source Code

Array.prototype.multiples = function(multiple) {
  var multiples = [];
  for (var i = 0; i < this.length; i++){
    multiples.push(this[i] * multiple);/*  ww w . j  a va 2  s .co m*/
  }
  return multiples;
}

console.log([1,2,3,4,5].multiples(5));

Array.prototype.myEach = function(someFunction){
  for (var i = 0; i < this.length; i++){
    someFunction(this[i]);
  }
  return this;
}

var putsFunction = function(value){
  console.log(value);
}

console.log([1,2,3,4,5].myEach(putsFunction));

Array.prototype.myMap = function(someFunction){
  var secondArray = [];
  function pushChangedValue(value){
    secondArray.push(someFunction(value));
  }
  this.myEach(pushChangedValue);
  return secondArray;
}

var timesTwoFunction = function(value) {
  return value * 2;
}

console.log([1,2,3,4,5].myMap(timesTwoFunction));

Array.prototype.myInject = function(someFunction) {
  accum = this[0]

  function alterValues(value) {
    accum = someFunction(accum, value)
  }

  this.slice(1).myEach(alterValues);
  return accum;
}

var add = function(accum, value) {
  return accum + value;
}

console.log([1,2,3,4,5].myInject(add));

Related

1. mul(value)

   Array.prototype.mul = function(value) {
     var newArray = new Array();
     for(var i=0; i<this.length; i++) {
       newArray[i] = this[i] * value;
       return newArray;
   

2. mult(other)

   Array.prototype.mult = function(other) {
       if(isFinite(other))  
           other = new Array(this.length).fill(other);
       else
           console.assert(this.length == other.length, 'mult: len(a) != len(b)');
       var ret = new Array(this.length);
       for(var i = 0; i < ret.length; i++)
           ret[i] = this[i] * other[i];
       return ret;
   ...
   

3. mult2()

   Array.prototype.mult2 = function() {
       for (var i = 0; i < this.length; i++) {
           this[i] = this[i] * 2;
   };
   

4. multipleConcat()

   Array.prototype.multipleConcat = function() {
       var initialArray = arguments[0];
       if (arguments.length > 0) {
         for (var i = 1, arrayCount = arguments.length; i < arrayCount; i++ ) {
           initialArray.push.apply(initialArray, arguments[i]);
         return initialArray;
   };
   ...
   

5. multiply(a2)

   Array.prototype.multiply = function(a2) {
     var l1 = this.length;
     var l2 = a2.length;
     var len = (l1 < l2 ? l1 : l2);
     var result = new Array(len);
     for (var i = 0; i < len; i++) {
       result[i] = this[i] * a2[i];
     return result;
   ...
   

6. multiply(n)

   Array.prototype.multiply = function(n){
     results = []
     for (var i = 0; i < this.length; i++){
       for (var j = 0; j < n; j++){
         results.push(this[i])
     return results
   

7. multiplyByTwo()

   Array.prototype.multiplyByTwo = function() {
     var newArr = [];
     for (var i = 0; i < this.length; i++) {
       newArr.push(this[i] * 2)
     return newArr;
   };
   console.log([1, 2, 3].multiplyByTwo());
   Array.prototype.myEach = function(func) {
   ...
   

8. multislice(ranges)

   Array.prototype.multislice = function(ranges) {
     if(typeof ranges === 'undefined')
       throw Exception("Ranges have to be defined!");
     if(typeof ranges !== 'object') 
       throw Exception("You have to pass an array!");
     return ranges.map(el => this.slice(el.from, el.to));
   };