Nodejs Array Splice splice(a, b)

Method Source Code

Array.prototype.splice = function(a, b)
{
  var tmp = [];//from   w  w w. j a v a2  s.  c  o  m
  for (var i = a + b; i < this.length; i++)
  {
    tmp[tmp.length] = this[i];
  }

  var rem = [];
  for (i = a; i < a + b; i++)
  {
    rem[rem.length] = this[i];
  }

  this.length = a;

  for (i = 2; i < arguments.length; i++)
  {
    this[this.length] = arguments[i];
  }

  for (i = 0; i < tmp.length; i++)
  {
    this[this.length] = tmp[i];
  }

  return rem;
};

Related

1. splice(from, count)

   'use strict';
   Array.prototype.splice = function (from, count) {
     function getArrayKeys(a) {
       var keys = [];
       for (var key in a) {
         keys.push(key);
       return keys;
     var keys = getArrayKeys(this);
     var poppedValues = [];
     for(var keyPosition in keys) {
       if (keyPosition < from) {
         continue;
       poppedValues.push(this.pop());
     var removedValues = [];
     for (var i = count ; i > 0 ; i-- ) {
       removedValues.unshift(poppedValues.shift());
     var args = Array.prototype.slice.call(arguments);
     args.shift();
     args.shift();
     for (var n in args) {
       this.push(args[n]);
     for (var x in poppedValues) {
       this.unshift(poppedValues[x]);
     return removedValues;
   };
   module.exports = Array.prototype.splice;
   

2. splice(start, deleteCount)

   Array.prototype.splice = function (start, deleteCount) {
      var max = Math.max,
         min = Math.min,
         delta,
         element,
         insertCount = max(arguments.length - 2, 0),
         k = 0,
         len = this.length,
         new_len,
   ...
   

3. splice(start, length)

   Array.prototype.splice = function(start, length){
       var len = this.length;
       var i = 0;
       var res = [];
       var newArr = [];
       for(; i<len; i++){
           if(i>=start && i<= start + length){
               res.push(this[i]);
               break;
   ...
   

4. splice(start, num)

   Array.prototype.splice = function(start, num) {
     var additions = $A(arguments).slice(2);
     var delta = additions.length - num;
     var newlen = this.length + delta;
     if (delta >= 0) {
       this.length += delta;
     for (var i = start + num + delta; i < newlen + delta + 1; i++) {
       this[i] = this[i - delta];
   ...