combine d3 datasets in typescript

To combine multiple datasets in d3 using TypeScript, you can use the d3-array library. Here is an example code:

index.ts
import * as d3 from 'd3';
import { Data } from './types'; // Assuming you have a Data type defined

const firstDataset: Data[] = [{x: 1, y: 2}, {x: 2, y: 4}, {x: 3, y: 6}];
const secondDataset: Data[] = [{x: 4, y: 8}, {x: 5, y: 10}, {x: 6, y: 12}];

const combinedDataset: Data[] = d3.merge([firstDataset, secondDataset]);

console.log(combinedDataset); // Output: [{x: 1, y: 2}, {x: 2, y: 4}, {x: 3, y: 6}, {x: 4, y: 8}, {x: 5, y: 10}, {x: 6, y: 12}]
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In this example, we have two datasets firstDataset and secondDataset, which are arrays of objects of type Data. We use the d3.merge function to combine these two arrays into a new array combinedDataset. The resulting array contains all the elements from both arrays in the order they appear.

Note that we have imported d3 as a library and have defined Data type to ensure correctness during compilation.