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D3.js | d3.set.empty() Function
  • Last Updated : 28 Jun, 2019

The set.empty() function in D3.js is used to return true if the given array has zero elements otherwise returns false.

Syntax:

d3.set([Array]).empty();

Parameters: This function accepts single parameter Array which is going to be searched whether it is empty or not.

Return Value: It returns true if the given array is empty otherwise returns false.

Below programs illustrate the d3.set.empty() function in D3.js:



Example 1:




<!DOCTYPE html>
<html>
  
<head>
    <title>
        d3.set.empty() function
    </title>
      
    <script src = "https://d3js.org/d3.v4.min.js"></script>
</head>
  
<body>
    <script>
      
         // Initialising an array
         Array1 = ["a"];
         Array2 = [];
         Array3 = ["Geeks", "gfg", "GeeksforGeeks"];
            
         // Calling the d3.set.empty() function
         A = d3.set(Array1).empty();
         B = d3.set(Array2).empty();
         C = d3.set(Array3).empty();
            
         // Getting the value true if the given array is 
         // empty otherwise returns false
         console.log(A);
         console.log(B);
         console.log(C);
    </script>
</body>
  
</html>                    

Output:

false
true
false

Example 2:




<!DOCTYPE html>
<html>
  
<head>
    <title>
        d3.set.empty() function
    </title>
      
    <script src = "https://d3js.org/d3.v4.min.js"></script>
</head>
  
<body>
    <script>
      
        // Calling the d3.set.empty() function
        // with a array as the parameter 
        A = d3.set([1, 2, 3, 3]).empty();
        B = d3.set([]).empty();
        C = d3.set(["a", "b", "c", "a", "b", "c"]).empty();
        
        // Getting the value true if the given array is
        // empty otherwise returns false
        console.log(A);
        console.log(B);
        console.log(C);
    </script>
</body>
  
</html>                    

Output:

false
true
false

Ref: https://devdocs.io/d3~5/d3-collection#set_empty




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