The set.clear() function in D3.js is used to remove all values from the set. It clears the set and holds that blank set you can check that in the 2nd example.
Syntax:
d3.set().clear();
Parameters: This function does not accept any parameters.
Return Value: This function does not returns any values.
Below programs illustrate the d3.set.clear() function in D3.js:
Example 1:
<!DOCTYPE html> <html>   <head>     <title> d3.set.clear() Function</title>   </head>   <body>     <script>           // Initialising the set         var set = d3.set(["1", "2", "a", "b", "Geeks"]);           // Checking the set         console.log(set);         // Calling the set.clear() function         set.clear();           // Checking whether any element is present         // in the set or not         A = set.has("a");         B = set.has("Geeks");           // Getting the output of true or false         console.log(A);         console.log(B);     </script> </body>   </html> |
Output:
{"$1":"1","$2":"2","$a":"a","$b":"b","$Geeks":"Geeks"}
false
false
Example 2:
<!DOCTYPE html> <html>   <head>     <title> d3.set.clear() Function</title>   </head>   <body>   <script>            // Initialising the set      var set = d3.set(["1", "2", "a", "b", "Geeks"]);             // Checking whether any element is present      // in the set or not before calling set.clear() function      A = set.has("a");      B = set.has("Geeks");             // Getting the output of true or false      console.log(A);      console.log(B);            // Calling the set.clear() function      set.clear();            // Checking whether any element is present      // in the set or not after calling set.clear() function      C = set.has("a");      D = set.has("Geeks");             // Getting the output of true or false      console.log(C);      console.log(D);         </script> </body>   </html> |
Output:
true true false false
Ref: https://devdocs.io/d3~5/d3-collection#set_clear
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