D3.js count() method Last Updated : 06 Apr, 2023 Summarize Comments Improve Suggest changes Share Like Article Like Report With the help of d3.count() method, we can get the count of valid values in the specified iterable data structure. Syntax: d3.count(iterable[, accessor]) Return value: It returns the count of valid values. Note: To execute the below examples you have to install the d3 library by using the command prompt for the following command. npm install d3 Example 1: In this example, we can see that by using d3.count() method, we are able to get the count of valid values in the specified iterables. JavaScript // Defining d3 contrib variable const d3 = require('d3'); data = [ { name: "ABC", amount: "34.0", date: "11/12/2015" }, { name: "DEF", amount: "120.11", date: "11/12/2015" }, { name: "MNO", amount: "12.01", date: "01/04/2016" }, { name: "ABC", amount: "34.05", date: "01/04/2016" } ] let gfg = d3.count(data, d => d.amount); console.log(gfg); Output: 4 Example 2: JavaScript // Defining d3 contrib variable const d3 = require('d3'); data = [ { name: "ABC", amount: "34.0", age: 20 }, { name: "DEF", amount: "120.11", age: NaN }, { name: "MNO", amount: "12.01", age: 23 }, { name: "DEF", amount: "34.05", age: 24 } ] let gfg = d3.count(data, d => d.age); console.log(gfg); Output : 3 Comment More infoAdvertise with us Next Article D3.js cumsum() Method J jitender_1998 Follow Improve Article Tags : JavaScript D3.js Similar Reads D3.js cumsum() Method With the help of d3.cumsum() method, we can get the cumulative sum of all the values of an array, that is the value at ith index is the cumulative sum of values from index 0 to index i by using this method. Syntax: d3.cumsum( iterable ) Parameter: This function has the following parameter as mention 2 min read Lodash _.countBy() Method Lodash _.countBy method creates an object composed of keys generated from the results of running each element of collection through iteratee. The corresponding value of each key is the number of times the key was returned by iterate. Syntax:_.countBy(collection, [iteratee=_.identity])Parameters: Thi 3 min read Collect.js countBy() Method The countBy() method is used to count the occurrence of values in the collection. This method counts the occurrence of every element. Syntax: collect(array).countBy() Parameters: The collect() method takes one argument that is converted into the collection and then countBy() method is applied on it. 1 min read D3.js node.count() Function The node.count() function of D3.js library is used to count the number of leaves under a particular node and append it as a value property to the object. If the node given is itself a leaf node then the count is one. Syntax: node.count(); Parameters: This function does not take any parameter. Return 2 min read Node.js console.count() Method The console.count() method is an inbuilt application programming interface of the console module which is used to count label passed to it as a parameter, by maintaining an internal counter for that specific label. Syntax: console.count(label) Parameters: This method has one parameter as mentioned a 2 min read Lodash _.frequencies() Method The Lodash _.frequencies() method takes an array and returns a mapping object whose keys are the values of the array’s elements and values are counts of that key appeared in that array. Syntax: _.frequencies( array ); Parameters: This method accepts a single parameter as mentioned above and describe 2 min read Like