how to use the sortedindexby function from lodash in javascript

sortedIndexBy is a function from lodash that is used to insert an element into an array in sorted order. The position where the element should be inserted is determined by iterating through the array using a provided function that maps each element to its sort value. Here's a basic syntax for using the sortedIndexBy method:

index.tsx
_.sortedIndexBy(array, value, iteratee)
40 chars
2 lines

Here,

• array: The sorted array to insert the value into.
• value: The value to be inserted into the array.
• iteratee: The function that maps each element to its sort value.

Here's an example usage of the sortedIndexBy method:

index.tsx
const _ = require('lodash');

const arr = [{ x: 10 }, { x: 20 }];
const idx = _.sortedIndexBy(arr, { x: 15 }, o => o.x);

console.log(idx); // Output: 1

arr.splice(idx, 0, { x: 15 });
console.log(arr); // Output: [{ x: 10 }, { x: 15 }, { x: 20 }]
248 chars
10 lines

In this example, we have an array arr that is sorted by the x property of its objects. We want to insert the object { x: 15 } into the array in its correct sorted position. We use _.sortedIndexBy to find the index where the object should be inserted, and then use splice to insert the object at that index.

Note that it's important that the array is sorted before using sortedIndexBy. Otherwise, the index returned might not be correct.