Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers, etc.
The _.meanBy() method is used to compute the mean value from the original array by iterating over each element in the array using the Iteratee function. It is almost the same as _.mean() function.
Syntax:
_.meanBy( array, [iteratee = _.identity] )
Parameters: This method accepts two parameters as mentioned above and described below:
- array: It is the array that the method iterates over to get the mean of all the elements.
- iteratee: It is the function that is invoked for every element in the array.
Return Value: This method returns the mean value of the array.
Example 1:
Javascript
// Requiring the lodash library  const _ = require("lodash");    // Original array var arr = [{ 'n': 4 }, { 'n': 2 }, { 'n': 6 }];     // Use of _.meanBy() method let mean_val =   _.meanBy(arr, function(o) { return o.n; });         // Printing the output  console.log(mean_val); |
Output:
4
Example 2: Â
Javascript
// Requiring the lodash library  const _ = require("lodash");    // Original array var arr = [{ 'n': 10 }, { 'n': 5 },            { 'n': 3 }, { 'n': 12 }];     // Use of _.meanBy()  // method let mean_val = _.meanBy(arr, 'n');         // Printing the output  console.log(mean_val); |
Output:
7.5
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