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D3.js | d3.sum() function
  • Last Updated : 26 Jun, 2019

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:

210
3
8.3
0.888

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, "GeeksforGeeks"];
  
        // 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:

0
0
1
5

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




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