Hello I am working with a large geojson dataset, and I am trying to see if I can merge the coordinate values of each entry based on entries that share the same “User_ID”. My dataset look like this: I have tried to merge the entries using the method shown in mwarren’s answer, url: “http…
Tag: reduce
Difference between two Objects – reduce
I’ve 2 Objects with data that is repeated but also varies. How to compare them and get the differences? I’ve to use .reduce. My work: but the output is without surname: “kowalski”. Expected output: Answer Please use this code
What is the reason array is available inside reduce(), map(), etc.?
In the following example, we have access to the array as numbers and arr. It seems more in line with functional programming to use the internal variable arr but what is an explicit reason why we should use it instead of the exterior variable, since, numbers and arr are both pointers to the same array value an…
Loop asynchronosly through array
I have following code: As you can see this does not work. So the content of the for loop works pretty well. It goes through the array and works well, but the for loop itself is the problem. How can I get the for loop wait for the inner content to finish before going to the next key? The timeline
I want to replace this forEach function with the same but done using reduce. Can you say where I am doing wrong?
I create the columns and I have a checkbox which shows the columns name. When I click a checkbox square I get an array of checked names which are stored in checkedKeys. Now checkableColumns contains all the possible checkable values. Those elements which are in checkableColumns but not in checkedKeys are thos…
Grouping and summing array objects
I’m having a data sample like this What I want to achieve with this data is to group it and sum it up so it comes out like this What the current code I have, I do not get the output as I want. Answer Try this
Why NaN’s reduce return?
I commented out the return sum, on purpose, because it does not work as expected. If I remove return sum, it returns the right average. But this is what I don’t understand: when it enters the if in the last index position, this return shows NaN. But why does it return NaN? Answer Let us assume the value…
Testing whether you reach an array’s last item when using reduce() in Javascript
I am trying to implement the equivalent of .join() using .reduce() to answer a quiz on executeprogram.com. My code passes the tests, but it seems ugly. The specific issue that I have solved in an ugly way is this: The constructed join() function takes an array and a separator as arguments, but the separator s…
What is the flow of execution with this compose function passed into Javascripts reduce?
I just want to know how reduce works in the case of code below(which was provided by a stackoverflow user in my previous question, i’m asking this question as his code snippet led to me having more questions that weren’t cleared up and are too long to fit in a comment section). An array of functio…
JS reduce: object accumulator titles
I am experimenting with the reduce function at the moment and wondering if I can tailor the accumulator’s keys’ name to be a specific value? For example, the below code returns {16 years of experience: … } but I would like the return results to be categorized like the below: Answer To group …