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

Last Updated : 28 Jun, 2019

The set.has() function in D3.js is used to return true if and only if the given set containing an entry for the specified value.

Syntax:

d3.set([Array]).has(element);

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

Array: It store the array elements in form of string.
element: This is the value which is going to be searched into the given array and if present then it returns true otherwise returns false.

Return Value: It returns true if the given array contains the specified value, otherwise returns false.

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

Example 1:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        d3.set.has() function
    </title> 
      
    <script src = "https://d3js.org/d3.v4.min.js"></script> 
</head> 
  
<body> 
    <script> 
      
        // Initialising an array 
        Array1 = ["a", "a", "b", "c"]; 
        Array2 = ["c", "c", "c"]; 
        Array3 = ["Geeks", "gfg", "GeeksforGeeks"]; 
          
        // Calling the d3.set.has() function 
        A = d3.set(Array1).has("a"); 
        B = d3.set(Array2).has("a"); 
        C = d3.set(Array3).has("Geeks"); 
          
        // Getting the value true if the specified element 
        // is present in the array otherwise false 
        console.log(A); 
        console.log(B); 
        console.log(C); 
    </script> 
</body> 
  
</html> 

Output:

true
false
true

Example 2:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        d3.set.has() function
    </title> 
      
    <script src = "https://d3js.org/d3.v4.min.js"></script> 
</head> 
  
<body> 
    <script> 
      
        // Calling the d3.set.has() function 
        // with a array and a element as the parameter  
        A = d3.set([1, 2, 3, 3]).has(4); 
        B = d3.set(["a"]).has("a"); 
        C = d3.set(["a", "b", "c", "a", "b", "c"]).has("d"); 
            
        // Getting the value true if the specified element 
        // is present in the array otherwise false 
        console.log(A); 
        console.log(B); 
        console.log(C); 
    </script> 
</body> 
  
</html> 