Nodejs Array Move Up moveUp(value, by)

Method Source Code

Array.prototype.moveUp = function(value, by) {
    var index = this.indexOf(value),
        newPos = index - (by || 1);/* w w  w  . ja v a  2 s .c o  m*/
    
    if(index === -1)
        throw new Error("Element not found in array");
    
    if(newPos < 0)
        newPos = 0;
        
    this.splice(index,1);
    this.splice(newPos,0,value);
    
    return newPos;
};

Related

1. moveUp(element, offset)

   Array.prototype.moveUp = 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 < 0) { newPos = 0; }
       this.splice(index,1);
       this.splice(newPos,0,element);
   };
   ...
   

2. moveUp(value, by)

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