how to use the sortedindexby function from the lodash library in typescript

To use the sortedIndexBy function from the Lodash library in TypeScript, you will first need to install both TypeScript and Lodash through a package manager like npm. Once installed, you can then import the sortedIndexBy function from the Lodash library.

Here's an example of how to use the sortedIndexBy function in TypeScript:

index.ts
import { sortedIndexBy } from 'lodash';

interface Item {
  id: number;
  name: string;
}

const items: Item[] = [
  {id: 1, name: 'Item 1'},
  {id: 3, name: 'Item 3'},
  {id: 4, name: 'Item 4'},
];

const newItem: Item = {id: 2, name: 'Item 2'};

const index = sortedIndexBy(items, newItem, item => item.id);

console.log(index); // Output: 1
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In this example, we have an array of Item objects that is already sorted by the id property. We then create a new Item object with an id of 2. We use the sortedIndexBy function to find the index at which the new item should be inserted in the items array while still maintaining the sorting order.

The sortedIndexBy function takes three arguments:

1. The array to search for the index in
2. The value to find the index for
3. The function used to extract the sort value from each element in the array

The function passed as the third argument always takes one argument which is an element in the array. This function is used to extract the sort value that will be used to determine the order of the elements in the array. In this example, we pass a function that extracts the id property from each Item object.

After the sortedIndexBy function is called, it returns the index at which the new item should be inserted into the array while still maintaining the sorting order. We then log the index to the console.