Nodejs Array Move Down moveElement(index, delta)

Method Source Code

/*//from w  ww  . j a v a 2s. co  m
    App Utilities
*/

Array.prototype.moveElement = function (index, delta) {
    var index2, temp_item;

    // Make sure the index is within the array bounds
    if (index < 0 || index >= this.length) {
        return false;
    }

    // Make sure the target index is within the array bounds
    index2 = index + delta;
    if (index2 < 0 || index2 >= this.length || index2 == index) {
        return false;
    }

    // Move the elements in the array
    temp_item = this[index2];
    this[index2] = this[index];
    this[index] = temp_item;

    return true;
};

Array.prototype.getPageData = function(data, pageSize, currentPageNo)
{
    var start = currentPageNo * pageSize,
        end = (currentPageNo * pageSize + pageSize) > data.length
                ? data.length
                : (pageSize * pageSize + pageSize);

    return data.slice(start, end);
};

Related

1. moveDown(element, offset)

   Array.prototype.moveDown = function(element, offset) 
       var index = this.indexOf(element); 
       var newPos = index + (offset || 1);
       if(index === -1) { throw new Error("Element not found in array"); }
       if(newPos >= this.length) { newPos = this.length; }
       this.splice(index, 1);
       this.splice(newPos,0,element);
   };
   ...
   

2. moveDown(value, by)

   Array.prototype.moveDown = function(value, by) {
     var index = this.indexOf(value);
     if (index === -1) {
       throw new Error('Item not found');
     var newPos = index + (pos || 1);
     if (newPos >= this.length) {
       newPos = this.length;
     this.splice(index, 1);
     this.splice(newPos, 0, value);
   

3. moveDown(value, by)

   Array.prototype.moveDown = function(value, by) {
       var index = this.indexOf(value),
           newPos = index + (by || 1);
       if(index === -1)
           throw new Error("Element not found in array");
       if(newPos >= this.length)
           newPos = this.length;
       this.splice(index, 1);
       this.splice(newPos,0,value);
   ...