The set.empty() function in D3.js is used to return true if the given array has zero elements otherwise returns false.
Syntax:
d3.set([Array]).empty();
Parameters: This function accepts single parameter Array which is going to be searched whether it is empty or not.
Return Value: It returns true if the given array is empty otherwise returns false.
Below programs illustrate the d3.set.empty() function in D3.js:
Example 1:
<!DOCTYPE html> <html> <head> <title> d3.set.empty() function </title> </head> <body> <script> // Initialising an array Array1 = ["a"]; Array2 = []; Array3 = ["Geeks", "gfg", "neveropen"]; // Calling the d3.set.empty() function A = d3.set(Array1).empty(); B = d3.set(Array2).empty(); C = d3.set(Array3).empty(); // Getting the value true if the given array is // empty otherwise returns false console.log(A); console.log(B); console.log(C); </script> </body> </html> |
Output:
false true false
Example 2:
<!DOCTYPE html> <html> <head> <title> d3.set.empty() function </title> </head> <body> <script> // Calling the d3.set.empty() function // with a array as the parameter A = d3.set([1, 2, 3, 3]).empty(); B = d3.set([]).empty(); C = d3.set(["a", "b", "c", "a", "b", "c"]).empty(); // Getting the value true if the given array is // empty otherwise returns 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_empty
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