The Lodash _.comparator() method takes a binary predicate-like function and returns a comparator function which can be used as a callback for _.sort() method etc.
Syntax:
_.comparator( function );
Parameters: This method accepts a single parameter as listed above and discussed below.
- function: It is a predicate like defined function.
Return Value: This method returns a comparator function.
Note: To execute the below examples, you have to install the lodash-contrib library by using this command prompt and execute the following command.
npm install lodash-contrib
Below examples illustrate the Lodash _.comparator() method in JavaScript:
Example 1: Sorting using a comparator function.
Javascript
// Defining lodash contrib variable var _ = require('lodash-contrib'); var gfgFun = function(x, y) { // Returns -1, 0 or 1 return x <= y; }; // Array var arr = [4, 8, 2, 9, 1]; var comp = _.comparator(gfgFun); // Using comparator function with _.sort() method arr.sort(comp); console.log("Sorted Array :",arr) |
Output:
Sorted Array : [ 1, 2, 4, 8, 9 ]
Example 2: Reverse Sorting using a comparator function.
Javascript
// Defining lodash contrib variable var _ = require('lodash-contrib'); var gfgFun = function(x, y) { // Returns -1, 0 or 1 return x >= y; }; // Array var arr = [1, 10, 2, 9, 1]; var comp = _.comparator(gfgFun); // Using comparator function with _.sort() method arr.sort(comp); console.log("Sorted Array :",arr) |
Output:
Sorted Array : [ 10, 9, 2, 1, 1 ]
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