D3.js group.get() Method

With the help of d3.group.get() method, we can get the values from the resulting map obtained by grouping an iterable data structure.

Syntax:

d3.group.get( value )

Return value: It returns the values from the map.

Note: To execute the below examples you have to install the d3 library by using this command prompt we have to execute the following command.

npm install d3

Example 1: In this example, we can see that by using d3.group.get() method, we are able to get the values from the resulting map obtained from the group.

Javascript

// Defining d3 contrib variable
var 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: "XYZ", amount: "34.05",  date: "01/04/2016"}
]

var grouped_data = d3.group(data, d => d.name)

console.log(grouped_data.get("ABC"))

Output:

[ { name: 'ABC', amount: '34.0', date: '11/12/2015' } ]

Example 2:

Javascript

// Defining d3 contrib variable
var d3 = require('d3');

data = [
  {name: "ABC", amount: "34.0",   date: "11/12/2019"},
  {name: "DEF", amount: "120.11", date: "11/02/2020"},
  {name: "MNO", amount: "12.01",  date: "01/04/2020"},
  {name: "XYZ", amount: "34.05",  date: "03/04/2020"}
]

var grouped_data = d3.group(data, d => d.name, d => d.date)

console.log(grouped_data.get("XYZ"))

Output:

Map {
  '03/04/2020' => [ 
    { name: 'XYZ', amount: '34.05', date: '03/04/2020' } ]
}