Lodash _.sortedIndexBy() Method
The _.sortedIndexBy() method is used to return the lowest index of the array where an element can be inserted and maintain its sorted order. In addition, it accepts iteratee which is invoked for value and each element of array to compute their sort ranking.It uses the binary search.
Syntax:
_.sortedIndexBy(array, value, [iteratee=_.identity])
Parameters: This method accepts three parameters as mentioned above and described below:
- array: This parameter holds the sorted array.
- value: This parameter holds the value to evaluate.
- Iteratee: This is the function that iterates over each element.
Return Value: This method returns the index at which the value should be inserted into the array.
Example 1: Here, const _ = require(‘lodash’) is used to import the lodash library into the file.
Javascript
// Requiring the lodash library const _ = require("lodash"); // Original array var objects = [{ 'x': 4 }, { 'x': 6 }]; // Use of _.sortedIndexBy() // method let index = _.sortedIndexBy(objects, { 'x': 5 }, function(o) { return o.x; }); // Printing the output console.log(index); |
Output:
1
Example 2:
Javascript
// Requiring the lodash library const _ = require("lodash"); // Original array var objects = [{ 'x': 4 }, { 'x': 6 }]; // Use of _.sortedIndexBy() // method let index = _.sortedIndexBy(objects, { 'x': 9 }, 'x'); // Printing the output console.log(index); |
Output:
2
Example 3:
Javascript
// Requiring the lodash library const _ = require("lodash"); // Original array let x = ['ajax', 'django', 'mongoDb', 'react', 'reactnative', 'yarn'] // Use of _.sortedIndexBy() // method let index = _.sortedIndexBy(x, 'luby', 5); // Printing the output console.log(index); |
Output:
3
Note: This will not work in normal JavaScript because it requires the library lodash to be installed.
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