opts.cache = null == opts.cache? this.enabled('view cache'): opts.cache;

opts.cache = (null == opts.cache? this.enabled('view cache'): opts.cache;)

opts.cache = ((null == opts.cache)? this.enabled('view cache'): opts.cache;)

coffee :
opts.cache = if opts.cache then this.enabled('view cache') else opts.cache

JavaScript:
opts.cache = if (null == opts.cache){
return this.enabled('view cache');
}else{
return opts.cache
}