A simple JS List that extends the native Array structure and adds a remove(index) method

List.js

List = function(arr){
	if( arr !== undefined){
		if( arr instanceof Array == false){
			for(var i in arguments){
				this.push( arguments[i] ); 
			}
		}else{
			for(var i in arr){
				this.push( arr[i] ); 
			}
		}
	}
}
List.prototype = new Array;
List.prototype.remove = function(i){
	if( i == 0){
		this.shift();
	}else if(i > 0){
		var first = this.splice(0, i-1);
		var result = first.concat( this.splice(1, this.length - 1) );
		while( this.length > 0 ) this.pop();
		for( var e in result){
			this.push( result[e] );
		}
	}
}
var l = new List(1,2,3,4,5)