The map.entries() function in D3.js used to return an array of key-value objects for the entry in the created map.
Syntax:
d3.map.entries();
Parameters: This function does not accept any parameter.
Return Value: This function returns an array of key-value pair for the entry in the created map.
Below programs illustrate the d3.map.entries() function in D3.js:
Example 1:
<!DOCTYPE html> <html>     <head>     <title>d3.map.entries() Function</title>     </head>   <body>   <script>             // Creating a map      var map1 = d3.map({"a": 1});      var map2 = d3.map({"GFG": 5});             // Calling the map.entries() function      A = map1.entries();      B = map2.entries();             // Getting the array of key value pair      console.log(A);      console.log(B);   </script> </body>   </html> |
Output:
[{"key":"a", "value":1}]
[{"key":"GFG", "value":5}]
Example 2:
<!DOCTYPE html> <html>     <head>     <title>d3.map.entries() Function</title>     </head>   <body>   <script>             // Creating a map      var map1 = d3.map({"Ram": 5}, {"Geek": 10});      var map2 = d3.map();             // Calling the map.entries() function      A = map1.entries();      B = map2.entries();             // Getting the array of key value pair      console.log(A);      console.log(B);   </script> </body>   </html> |
Output:
[{"key":"Ram", "value":5}]
[]
Note: Map2 was null that is why it’s became blank.
Reference: https://devdocs.io/d3~5/d3-collection#map_entries
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