The d3.keys() function in D3.js is used to return an array containing the property names or keys of the specified object or an associative array.
Syntax:
d3.keys(object)
Parameters: This function accepts single parameter object containing key and value in pairs.
Return Value: It returns the keys of the given object.
Below programs illustrate the d3.keys() function in D3.js:
Example 1:
<!DOCTYPE html> <html>   <head>     <title>         d3.keys() Function     </title>       </head>   <body>     <script>               // Initialising an object         var month = {             "January": 1,             "February": 2,             "March": 3,             "April": 4         };                       // Calling the d3.keys() function         A = d3.keys(month);                 // Getting the key values of the given object         document.write(A);     </script> </body>   </html>                    |
Output:
January, February, March, April
Example 2:
<!DOCTYPE html> <html>   <head>     <title>         d3.keys() Function     </title>       </head>   <body>     <script>               // Initialising an object         var month = {             "neveropen": 0,             "Geeks": 2,             "Geek": 3,             "gfg": 4         };                       // Calling the d3.keys() function         A = d3.keys(month);                 // Getting the key values of the given object         document.write(A);     </script> </body>   </html>                    |
Output:
neveropen, Geeks, Geek, gfg
Reference: https://devdocs.io/d3~5/d3-collection#keys
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