Combining information once constructing a complex array structure in JavaScript

Question

Combining information once constructing a complex array structure in JavaScript

My reduce function is successfully building multiple levels of data, but I have encountered an issue. Currently, it organizes the data by employee first, then by date, area, and job. While all the data is displayed correctly at each level, I am now attempting to aggregate specific data for a totals section at the date level.

The problem arises when I try to calculate the total number of scans for orders on a particular date. Instead of aggregating the values, it simply lists them individually. To address this issue, I want to create a new value called "total_scans" that sums up all scans for any orders placed on that date.

In the code snippet below, my goal is to update the total_scans value so that it correctly reflects the sum of scans for all orders on a given date. For instance, for Miranda's record on 8/12, the total_scans at the date level should be 49. Am I moving in the right direction?

javascript vue.js

Answer 1

Answer №1

Your implementation of the reduce function seems a bit unusual. The purpose of using reduce is to consolidate an iterable (such as an array) into a single value, typically a String or Number.

Furthermore, by making changes directly to objects and arrays within your reducer, you are introducing unintended side effects. Since JavaScript passes arrays and objects by reference, any modifications made will affect the original data object, which goes against Vue's recommended practices. If you need to alter data, consider using a watch instead of a computed.

Additionally, it appears that your reduce function may be overly complex. Instead of a lengthy reduce operation, you could simplify it as shown below, with an initial value of 0:

const nest = (rows) =>
  rows.reduce(
    (sum, row) => {
       return sum + row['scans'];          
    },
    0
  );

This code snippet calculates the total number of scans. If you only want to count scans based on a specific date, you can optimize the process by filtering the array first. Consider something like this:

const nest = (rows) => 
  rows.filter(({job_date}) => job_date === SomeDate).reduce(...)

The {job_date} represents a destructuring assignment syntax. You could also create a separate computed property for the filtered dates array.

Answer 2

Your implementation of the reduce function seems a bit unusual. The purpose of using reduce is to consolidate an iterable (such as an array) into a single value, typically a String or Number.

Furthermore, by making changes directly to objects and arrays within your reducer, you are introducing unintended side effects. Since JavaScript passes arrays and objects by reference, any modifications made will affect the original data object, which goes against Vue's recommended practices. If you need to alter data, consider using a watch instead of a computed.

Additionally, it appears that your reduce function may be overly complex. Instead of a lengthy reduce operation, you could simplify it as shown below, with an initial value of 0:

const nest = (rows) =>
  rows.reduce(
    (sum, row) => {
       return sum + row['scans'];          
    },
    0
  );

This code snippet calculates the total number of scans. If you only want to count scans based on a specific date, you can optimize the process by filtering the array first. Consider something like this:

const nest = (rows) => 
  rows.filter(({job_date}) => job_date === SomeDate).reduce(...)

The {job_date} represents a destructuring assignment syntax. You could also create a separate computed property for the filtered dates array.

Combining information once constructing a complex array structure in JavaScript

Answer №1

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