Lodash _.sortedIndexOf() Method
Lodash _.sortedIndexOf() method is used to get the index of the first occurrence of the particular element in the sorted array. It uses the binary search to sort an array.
Syntax:
_.sortedIndexOf(array, value);
Parameters:
- array: This parameter holds the sorted array.
- value: This parameter holds the value to evaluate.
Return Value:
This method returns the index at which the value should be inserted into the array, other returns -1.
Example 1: In this example, we are getting the index at which we got the given value in the given array.
Javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let x = [1, 2, 3, 4, 4, 4, 5, 6, 6] // Use of _.sortedIndexOf() // method let index = _.sortedIndexOf(x, 4); // Printing the output console.log(index); |
Output:
3
Example 2:In this example, we are getting the index at which we got the given value in the given array.
Javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let x = [ 'a' , 'b' , 'c' , 'd' , 'e' , 'e' , 'e' , 'f' ] // Use of _.sortedIndexOf() // method let index = _.sortedIndexOf(x, 'e' ); // Printing the output console.log(index); |
Output:
4
Example 3: In this example, we are getting -1 as the index because the given value is not present in the given array.
Javascript
// Requiring the lodash library const _ = require( "lodash" ); // Original array let x = [ 'ajax' , 'django' , 'mongoDb' , 'react' , 'reactnative' , 'yarn' ] // Use of _.sortedIndexOf() // method let index = _.sortedIndexOf(x, 'luby' ); // Printing the output console.log(index); |
Output:
-1
Note: This will not work in normal JavaScript because it requires the library lodash to be installed.
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