Wordle’s an immensely popular word game (we post the answers daily) from The New York Times, but it’s not the most personal game in the world. Answers such as GUISE and PERIL are tricky, but generic.

Just as calculators took over the tedious number-crunching in maths a few decades ago, artificial intelligence (AI) is transforming coding. Take Kyo, an eight-year-old boy in Singapore who developed a ...