Tag: reduce

Javascript reduce() on array of objects, with entries being simple variables and array as well

I’m trying to use the reduce function in order to iterate through an array of objects and to get an output summing up the data shown inside of the array of objects (a kind of duplicate remover in fact). On data such as : when using the function : It will fork fine if I call this getValues function getValues(mainData,

4th argument in reduce

javascript reduce typescript

Here is the function: The fourth argument to reduce is the array that we’re iterating over. I can log it and I get the correct result (10) see above. But when I try to use it and assign it to a variable I get an error(see above). Could someone please shed some light? Answer From Mozilla’s page, the fourth parameter

Compare objects within an array and create a new array without duplicates

arrays grouping javascript object reduce

I’ve an array of objects: I want to compare the objects within an array by name. If the duplicate name exists, I should compare the age and only keep the higher age object. The expected output should be: I am new to javascript/typescript and couldn’t find any optimal solution for this problem. I hope, I was able to explain my

how to alter reduce function so it produce different result

arrays data-structures javascript object reduce

I have this array: I want to transform that array into I have this code that doing about that: What it missing is ignoring the sections. Any ideas how to modify that reduce function so it will produce expected result? To determine a section I came up with this funciton: Answer I would use the same approach from my answer

How to group nested array of objects in js

arrays javascript object reactjs reduce

I have a nested array of objects. I’m trying to group product objects that have the same value. Each objects has a vendor property containing an email. I am trying to group the objects by matching vendor email This is how my database looks like: I am trying to do it with the reduce method but the problem is with

Convert string into an object using reduce javascript

arrays javascript javascript-objects reduce

I am trying to convert a string like “sheep” into an object like this: Currently I can use reduce method in javascript and achive this: I have tried to read similar posts but I am pretty new to JS. Can anyone please help me? Thanks. Answer Try like this

Typescript reducer’s switch case typeguard doesn’t work with object spread

javascript reduce typeguards typescript

I have a reducer that does different actions depending on the action.type, actions payload is different for certain actions. This code won’t work, the errors will say that my action payload can be State or { id: string; data: TypeEditData }. However, if I access the payload property inside switch case using dot notation like so There won’t be any

Compare two array of objects and return matching values in a new array

arrays foreach intersection javascript reduce

I have two arrays of objects: inputData and jobList. I have to compare the primarySkills array of both the array of objects and return only those values which are matching in both the array.My array of objects are as below: I have done the below mentioned code to achieve this: Answer Edit according to the OP’s more detailed further request

Transform an Array into an Object using .reduce()

arrays javascript reduce

I am trying to study Array.reduce. And I was given the following task: Input data: And I need to get this data in the output I tried to write some code, but I have no idea how to do it correctly. How can I solve this problem? Code: Answer Corrected the logic

How does one create an object from an array of data items?

arrays foreach javascript object reduce

I’m struggling to create an object from an array in JS. I keep getting an error when pushing into the plots object. Answer In JS, an array has no named keys, it’s only a list of things. If you want named keys, use an object {} plots[status] is never initialized. When you try to .push() stuff in something undefined, the