D3.js | d3.set.add() Function

The set.add() function in D3.js is used to add the specified value string to the created set.

Syntax:

d3.set().add(element);

Parameters: This function accepts single parameter element which is going to be added into the created set.

Return Value: This function does not returns any values.

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

Example 1:

<!DOCTYPE html> 
  
<html> 
   
<head> 
    <title> d3.set.add() Function</title> 
   
    <script src='https://d3js.org/d3.v4.min.js'></script> 
</head> 
  
<body> 
  <script> 
      
     // Initialising the set 
     var set = d3.set() 
    .add("Geeks") 
    .add("Geeks") 
    .add("gfg"); 
  
    // Checking whether the desired element is  
    // present or not 
    A = set.has("GeeksforGeeks"); 
    B = set.has("Ram"); 
    C = set.has("Geeks"); 
      
    // Getting the output of true or false 
    console.log(A); 
    console.log(B); 
    console.log(C); 
  </script> 
</body> 
  
</html> 

Output:

false
false
true

Example 2:

<!DOCTYPE html> 
  
<html> 
   
<head> 
    <title> d3.set.add() Function</title> 
   
    <script src='https://d3js.org/d3.v4.min.js'></script> 
</head> 
  
<body> 
  <script> 
      
     // Initialising the set 
     var set = d3.set().add("a").add(1).add(123); 
  
    // Checking whether the desired element is  
    // present or not 
    A = set.has("a"); 
    B = set.has(123); 
    C = set.has(5); 
      
    // Getting the output of true or false 
    console.log(A); 
    console.log(B); 
    console.log(C); 
  </script> 
</body> 
  
</html> 

Output:

true
true
false

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

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