Nodejs Array Remove by Index removeAt(index)

Method Source Code

// Given an array and an index into the array, remove and return the array value at that index.

Array.prototype.removeAt = function(index) {
   index = parseInt(Math.floor(index));
   if (Number.isNaN(index)){
      return undefined;
   }/*ww  w.j a va2  s .  c o m*/
   var temp = this[index];

   for (var i = index; i < this.length-1; i++) {
      this[i] = this[i+1];
   }
   if (index <= this.length) {
      this.length = this.length-1;
   }
   return temp;
}

// test cases

//successful case
var array = [0,1,2];
var removedValue = array.removeAt(0);
console.log(array);
console.log(removedValue);

//removing at an index that is not an integer and outside the array
array = [0,1,2];
removedValue = array.removeAt(4.4);
console.log(array);
console.log(removedValue);

//removing at an index that is not a number
array = [0,1,2];
removedValue = array.removeAt("A");
console.log(array);
console.log(removedValue);

Related

1. removeAt( index )

   Array.prototype.removeAt = function( index ){
     if(index>=0 && index<this.length){
       for(var i=index; i<this.length; i++){
         this[i] = this[i+1];
       this.length = this.length-1;
     return this;
   function removeElement(index,array){
     if(index>=0 && index<array.length){
       for(var i=index; i<array.length; i++){
         array[i] = array[i+1];
       array.length = array.length-1;
     return array;
   

2. removeAt( index )

   Array.prototype.removeAt = function( index )
     var part1 = this.slice( 0, index );
     var part2 = this.slice( index );
     part1.pop();
     return( part1.concat( part2 ) );
   

3. removeAt(index)

   Array.prototype.removeAt = function (index)
       if (this.length <= index || index < 0)
           return;
       for (var i = index + 1, n = index; i < this.length; ++i, ++n)
           this[n] = this[i];
   ...
   

4. removeAt(index)

   Array.prototype.removeAt = function(index) {
       this.splice(index, 1);
   

5. removeAt(index)

   "use strict";
   Array.prototype.removeAt = function(index) {
       this.splice(index, 1);
       return this;
   };
   Array.prototype.print = function() {
       for (var i = 0; i < this.length; i++) {
           console.log(this[i] + ", ");
   };
   Array.prototype.remove = function() {
       var what, a = arguments,
           L = a.length,
           ax;
       while (L && this.length) {
           what = a[--L];
           while ((ax = this.indexOf(what)) !== -1) {
               this.splice(ax, 1);
       return this;
   };
   

6. removeAt(index)

   Array.prototype.removeAt=function(index){
     this.splice(index,1);
   

7. removeAt(index)

   Array.prototype.removeAt = function(index) {
       if (index > this.length - 1 || index < 0) {
           throw new Error("Index out of range");
       this.splice(index, 1);
   };
   

8. removeAt(position)

   Array.prototype.removeAt = function(position){
       this.splice(position,1);
   };
   

9. removeAtIndex(elementAt)

   Array.prototype.removeAtIndex = function(elementAt) {
     return this[elementAt - 1];
   };