D3.js | d3.set.empty() Function Last Updated : 28 Jun, 2019 Summarize Comments Improve Suggest changes Share Like Article Like Report 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: javascript <!DOCTYPE html> <html> <head> <title> d3.set.empty() function </title> <script src = "https://d3js.org/d3.v4.min.js"></script> </head> <body> <script> // Initialising an array Array1 = ["a"]; Array2 = []; Array3 = ["Geeks", "gfg", "GeeksforGeeks"]; // 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: javascript <!DOCTYPE html> <html> <head> <title> d3.set.empty() function </title> <script src = "https://d3js.org/d3.v4.min.js"></script> </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 Comment More infoAdvertise with us Next Article D3.js | d3.set.empty() Function K Kanchan_Ray Follow Improve Article Tags : JavaScript Web Technologies D3.js Similar Reads D3.js d3.map.empty() Function The d3.map.empty() function in D3.js checks whether a d3.map object is empty. It returns a boolean value: true if the map contains no key-value pairs, and false otherwise. This function helps determine if a map is populated or not.Syntaxmap.empty();Parameters: This function does not accept any param 3 min read D3.js selection.empty() Function The d3.empty() function in D3.js is used to return a boolean value. The value is true when the selection contains no elements and it returns false when the selection is non-empty. Syntax: selection.empty(); Parameters: This function takes no parameters. Return Values: This function returns a boolean 1 min read D3.js | d3.select() Function The d3.select() function in D3.js is used to select the first element that matches the specified selector string. If any element is not matched then it returns the empty selection. If multiple elements are matched with the selector then only the first matching element will be selected. Syntax: d3.se 1 min read 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 prog 1 min read D3.js | d3.map.set() Function The map.set() function in D3.js used to set the values for the specified key string in to the created map. Syntax: d3.map.set(key, value); Parameters: This function accepts two parameters which are illustrated below: key: This is the key string. value: This is the corresponding value for each key st 2 min read Like