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>       </head>   <body>     <script>               // Initialising an array         Array1 = ["a", "a", "b", "c"];         Array2 = ["c", "c", "c"];         Array3 = ["Geeks", "gfg", "neveropen"];                   // 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>       </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> |
Output:
false true false
Ref: https://devdocs.io/d3~5/d3-collection#set_has
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