Nodejs Array Convert toNumber()

Method Source Code

/**//from   w w w. j  a va 2  s.co  m
 * Convert an array of digits to a number
 * @returns {Number}
 */
Array.prototype.toNumber = Array.prototype.toNumber || function () {
  let result;

  this.forEach(digit => {
    let power = 10;
    while (digit >= power) {
      power *= 10;
    }
    result = ((result || 0) * power) + digit;
  });

  return result;
};

Related

1. toInts()

   Array.prototype.toInts = function(){
     return this.map(function(val){
       return parseInt(val, 10);
     });
   };
   

2. toJSON()

   Array.prototype.toJSON = function(){
       var result = [];
       this.forEach(function(item,index){
           result.push( item.toJSON ? item.toJSON() : item );
       });
       return result;
   

3. toJson()

   Array.prototype.toJson = function(){
     return JSON.stringify(this);
   };
   

4. toList(separator, aggregator)

   Array.prototype.toList = function(separator, aggregator) {
     aggregator = aggregator || separator;
     return this.join(aggregator, [this.join(separator, this.slice(0, -1)), this.slice(-1)]);
   };
   

5. toNumFixed(num)

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

6. toNumbers()

   Array.prototype.toNumbers = function() {
     for (var i=0; i<this.length;i++) {
       var val = Number(this[i]);
       if (!isNaN(val)) {
         this[i] = val;
       } else {
         this[i] = 0;
     return this;
   };
   

7. toNumsOnly()

   Array.prototype.toNumsOnly = function() {
     return this.filter(el => !parseInt(el, 10).isNotNumber());
   };
   

8. toObject()

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

9. toObject()

   'use strict';
   Array.prototype.toObject = function() {
     var arr = this,
       res = { } ;
     for (var i = 0 ; i < arr.length ; i++) {
       res[ arr[i] ] = arr[i]
     return res