D3.js | d3.merge() function

Last Updated : 26 Jun, 2019

The d3.merge() function in D3.js is used to merge the two given array into a single array.

Syntax:

d3.merge(Array1, Array2)

Parameters: This function accepts two parameters which are mentioned above and described below:

Array1: This is the first array whose elements are going to be merged with array2.
Array2: This is the second array whose elements are going to be merged with array1.

Return Value: It returns the merged single array.

Below programs illustrate the d3.merge() function in D3.js.
Example 1:

<html> 
  
<head> 
    <title>Getting a single array after  
      merging of the two given array</title> 
</head> 
  
<body> 
    <script src='https://d3js.org/d3.v4.min.js'> 
  </script> 
  
    <script> 
        // initialising the arrays of elements 
        var Array1 = [10, 20, 30]; 
        var Array2 = [1, 2, 3]; 
  
        // Calling to d3.merge() function 
        A = d3.merge([ 
            [Array1], 
            [Array2] 
        ]); 
  
        // Getting a single array after  
        // merging of the two given array 
        document.write(A + "<br>"); 
    </script> 
</body> 
  
</html> 

Output:

[10, 20, 30, 1, 2, 3]

Example 2:

<html> 
  
<head> 
    <title> 
      Getting a single array after 
      merging of the two given array 
  </title> 
</head> 
  
<body> 
    <script src='https://d3js.org/d3.v4.min.js'> 
  </script> 
  
    <script> 
        // initialising the arrays of elements 
        var Array1 = ["A", "B", "C"]; 
        var Array2 = ["a", "b", "c"]; 
  
        // Calling to d3.merge() function 
        A = d3.merge([ 
            [Array1], 
            [Array2] 
        ]); 
  
        // Getting a single array  
        // after merging of the two given array 
        document.write(A + "<br>"); 
    </script> 
</body> 
  
</html> 