benwells / reduce-example.js. Creating an object consists of elements of the array input as the object property and the array of index(es) where each was found as the value (of the object property). Second, declare a numbersvariable of type Array. javascript by Bhishma'S on Apr 29 2020 Donate . Thank you! Lectures by Walter Lewin. The callback function takes two parameters result and current element. This will produce the following output in console −, Sorting objects by numeric values - JavaScript, Sum from array values with similar key in JavaScript, Sum of array object property values in new array of objects in JavaScript, Merge objects in array with similar key JavaScript, Sum all similar elements in one array - JavaScript, Fill missing numeric values in a JavaScript array, Sum identical elements within one array in JavaScript, Sorting an array of objects by property values - JavaScript. Neither the length of a JavaScript array nor the types of its elements are fixed. JavaScript: Remove Duplicate Objects From Array; javaScript Sum Array Object Values. 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We are required to write a JavaScript function that takes in one such array and combines the value property of all those objects that have similar value for the firstName property. Therefore, for the above array, the output should look like −, For each object, we will recursively find their similar objects. Ask Question Asked 9 months ago. 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