shorthand.js

		this.current == (this.total - 1) ? (this.current = 0 && this.prev = (this.total - 1)) : (this.current += 1 && this.prev = (this.current - 1))
		
    if(this.current == (this.total - 1)) {
			this.current = 0
			this.prev = (this.total - 1)
		} else {
			this.current += 1
			this.prev = (this.current - 1)
		}