With the help of Array.from() method, we can convert the map into an array by using this method.
Syntax :
Array.from( map )
Return value: It returns an array of different elements.
Note: To execute the below examples you have to install the d3 library by using the command prompt we have to execute the following command.
npm install d3
Example 1: In this example we can see that by using Array.from() method, we are able to get the array from map after conversion.
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 gfg = d3.group(data, d => d.name); console.log(Array.from(gfg)); |
Output:
[ [ 'ABC', [ [Object] ] ], [ 'DEF', [ [Object] ] ], [ 'MNO', [ [Object] ] ], [ 'XYZ', [ [Object] ] ] ]
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 gfg = d3.group(data, d => d.name, d => d.date); console.log(Array.from(gfg)); |
Output:
[ [ 'ABC', Map { '11/12/2019' => [Array] } ],
[ 'DEF', Map { '11/02/2020' => [Array] } ],
[ 'MNO', Map { '01/04/2020' => [Array] } ],
[ 'XYZ', Map { '03/04/2020' => [Array] } ] ]
