The laptop market is incredibly saturated at the moment, making it difficult to find a laptop with exactly the features you need (or more accurately, a laptop without features you don’t need). If you have decided you need an affordable device that functions both as a tablet and laptop that can allow you to code on the run, there are a range of options and manufacturers available to you.
There are currently three big models in the convertible laptop market at the moment. The first is the ASUS Flip TP300La. With 8GB of RAM, it has impressive task-speed and application power. The touchscreen is 13.3′, but only has a resolution of 1920×1080, which is relatively low resolution for the convertibles. It also uses an 500GB HDD, meaning the start-up time is a little slower than it’s competitors, but it does have more space than the SSD alternatives. The laptop usually costs about $599.
For the same price as the ASUS Flip, you could buy the Dell XPS 11, which is superior in a number of ways. First, the resolution is 2560×1440 and the battery life is about an hour longer. The screen is smaller than the ASUS Flip at 11.6″, and the processor is a small step down (going from an i5-4210U to an i5-4210Y), but overall the XPS 11 provides a much better user experience than the Flip. The 128GB SSD doesn’t hold much, but it should be enough for all programming and coding needs.
If those two models don’t have enough power for you, the best option may be to spend a little more for the Lenovo Yoga 2 Pro. The Yoga 2 Pro costs around $699, and is a marked improvement in screen resolution and battery life. At 3200×1800 pixels, it looks amazingly sharp. The only downside is the limited Ram (4GB) but the fast i3-4020U slightly eases the pain.
Any of these options allow for maximum portability, not weighing more than 4 lbs, and has enough power to make sure you can do everything you need to.