CrazyDRY.js

Array.implement({

	item: function(at){
		if (!this.length) return null;
		if (at < 0) at += this.length;
		return (at < this.length) ? this[at] : null;
	},
	
	item: function(at){
		if (!this.length || (at < 0 && (at += this.length) && false) || at > this.length) return null;
		return this[at];
	},
	
	item: function(at){
		return (!this.length || (at < 0 && (at += this.length) && false) || at > this.length) ? null : this[at];
	},

	item: function(at){
		return (!this.length || ((at < 0) ? at += this.length : at) > this.length) ? null : this[at];
	},

	item: function(at, l){
		return (!(l = this.length) || ((at < 0) ? at += l : at) > l) ? null : this[at];
	}

});