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<html> <head> <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/d3@7"></script> </head> <body> <h3>D3 Nest API</h3> <script> var data = [{"color": "red", "key": 1}, {"color": "green", "key": 2}, {"color": "blue", "key": 75}] var nest = d3.nest().key(function (d) { return d.color; }).entries(data); console.log(nest); var filter = nest.filter(function (d) { return d.key === 'red' }) console.log(filter); </script> </body> </html>