Tag: arrays

javascript – console.log prints an array with its brackets ” [ ]” and not just the content

I have this code And as you can see, when you run the code, it prints the brackets as well. Why? (I am new to javascript so i know that this might seem like a stupid question to ask..) Answer This is simply how your console has chosen to represent arrays—by writing each element enclosed in brackets. It helps …

Understanding Behaviour of Find method in Javascript

arrays higher-order-functions javascript

In the above example, I’m updating the result returned by the find method but it also changes the value of the original array why so? Answer It’s because Objects in JavaScript are passed by reference, you got that object ( {age : 3} ) in exists then added 1 to it’s “age” key , so…

Combine objects in an array with the same id but sum totals

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I currently have an array of objects that looks like this: How would I combine the totals for any object in the array that shares the same userId? I would like my outcome to look like this: Answer Try this:

Javascript array recursion question – looping through “sections”

arrays javascript nested nested-loops recursion

I’m strugguling with Javascript on how to find all combinations of an array source with n depth that is broken into sections (0, 1, & 2 in example below). I want to end up with each possible cominbation – and each returned array should include one and only one value from each group. I’ve…

How do I convert a nested array to a ‘keyed’ array in JavaScript?

arrays javascript

I have a nested array that looks like this: [[“Organisation”,”ID”,”Name”],[“ACME”,”123456″,”Bart Simpson”],[“ACME”,”654321″,”Ned Flanders”],[“ACME”,”1234″,”Edna Kabappel&#8…

If else not working as intended, is there something wrong with my logic?

arrays foreach if-statement javascript loops

I’m trying to loop through an array and if there are any matching elements, it should push true to a new array else return false. By this logic, wordPerformance should return however, it is returning Maybe there is something I’m not seeing? Answer You have to first split the wordsIncorrect string …

I need to minus one key, of array of objects, from another key of another array of objects

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I have next two arrays: if startDate is between startDay and endDay, I have to minus firstArray number and secondArray number creating new key with result As result, I have to put new key in firstArray with result: if I have more than one startDate in the same range(between startDay and endDay) I have to add …

Why do I get different answer when using `++` vs using `+1` [closed]

algorithm arrays for-loop javascript

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers. Closed 1 y…

Add row in google Spreadsheet with javascript

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Adds the value below the line created earlier. I’m trying to get me to add a line at “2:2” and put the value on that line, and the other values stay below. The maximum result I got so far was to make the new line erase the old one and paste the new value in the same field. Any solutions…

Javascript Get the common elements of three arrays

arrays intersection javascript

I am trying to filter the common elements of 3 arrays. But instead of getting the common elements of 3 arrays, it only reads the 2 arrays and not the 3rd array. Here is my code, thank you: Answer As mentioned by @Titus, the issue in your code is the double return statements – once the first return is fo…