D3.js | d3.sum() function

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The d3.sum() function in D3.js is used to return the sum of the given array’s elements. If the array is empty then it returns 0.

Syntax:

d3.sum(Array)

Parameters: This function accepts a parameters Array which is an array of elements whose sum are to be calculated.

Return Value: It returns the sum of the given array’s element.

Below programs illustrate the d3.sum() function in D3.js.

Example 1:

<html> 
  
<head> 
    <title> 
      Getting sum of the elements of given array 
  </title> 
</head> 
  
<body> 
    <script src='https://d3js.org/d3.v4.min.js'> 
  </script> 
  
    <script> 
        // initialising the array of elements 
        var Array1 = [10, 20, 30, 40, 50, 60]; 
        var Array2 = [1, 2]; 
        var Array3 = [0, 1.5, 6.8]; 
        var Array4 = [.8, .08, .008]; 
  
        // Calling to d3.sum() function 
        A = d3.sum(Array1); 
        B = d3.sum(Array2); 
        C = d3.sum(Array3); 
        D = d3.sum(Array4); 
  
        // Getting sum of the given array's element 
        document.write(A + "<br>"); 
        document.write(B + "<br>"); 
        document.write(C + "<br>"); 
        document.write(D + "<br>"); 
    </script> 
</body> 
  
</html> 

Output:

Example 2:

<html> 
  
<head> 
    <title> 
      Getting sum of the elements of given array 
  </title> 
</head> 
  
<body> 
    <script src='https://d3js.org/d3.v4.min.js'> 
  </script> 
  
    <script> 
        // initialising the array of elements 
        var Array1 = []; 
        var Array2 = ["a", "b", "c"]; 
        var Array3 = [1, "B", "C"]; 
        var Array4 = ["Geek", "Geeks", 2, 3, "zambiatek"]; 
  
        // Calling to d3.sum() function 
        A = d3.sum(Array1); 
        B = d3.sum(Array2); 
        C = d3.sum(Array3); 
        D = d3.sum(Array4); 
  
        // Getting sum of the given array's element 
        document.write(A + "<br>"); 
        document.write(B + "<br>"); 
        document.write(C + "<br>"); 
        document.write(D + "<br>"); 
    </script> 
</body> 
  
</html> 

Output:

Note: In the above output, if the parameter is empty or strings then it returns 0 and if the parameter is string including some integers value then the sum of the integer’s value is returned.

Ref: https://devdocs.io/d3~4/d3-array#sum