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<!DOCTYPE html> <head> <meta charset="utf-8"> <script src="https://d3js.org/d3.v4.min.js"></script> <style> body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } </style> </head> <body> <script> var startArray = [] var updateArray = ["dog"] if(startArray.length < updateArray.length) { var name = updateArray.filter(f => !startArray.includes(f)); console.log(name); } else { var name = startArray.filter(f => !updateArray.includes(f)); console.log(name); } </script> </body>
https://d3js.org/d3.v4.min.js