<html><head> <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@7"></script></head><body><h3>D3 collection API</h3><script> var month = {"jan": 1, "Feb": 2, "mar": 3, "apr": 4}; console.log(d3.keys(month)); console.log(d3.values(month)); console.log(d3.entries(month));</script></body></html>