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>
<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>
<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