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Questions - reduce

Invalid Reference $$this for mongo array reduce arithmetic operation in java

First of all here is project before reduce How you can see there is a list called "1" with 3 fields (zone, duration, type) I'm trying to reduce it and get the total sum of durations on 1_to...
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París

java

mongodb

math

reduce

Votes: 0

Answers: 1

Latest Answer

Not a perfect solution but I managed to get what i needed like this STEPS: 1- Convert "duration" to String 2- Reduce Array to a concatenated String separated with "," AggregationEx...
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París

javascript - using reduce to group by, how do I sum (typescript)

Using typescript, I have my javascript successfully using the reduce function to group by but I can't figure out how to sum another property. Right now everything is being grouped by property: pacct. ...
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solarissf

javascript

reduce

Votes: 0

Answers: 1

Latest Answer

We'll give reduce an initial value of 0, and then for each trade, we add the quantity to the total. const sum = trades.reduce((total, trade) => total + trade.quantity, 0); The returned value of th...
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user16912306

Aggregate array of objects based on to attributes in Typescript

I have e.g. this array in typescript: const array = [ { id_m: "123", period: "Q1/22", amount: 1000 }, { id_m: "123", period: "Q1/22", amou...
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Alex

typescript

aggregate

reduce

Votes: 0

Answers: 1

Latest Answer

First type your data, then you can use reduce array method, adding to the accumulated values the type you created, something like: type Data = { id_m: string; period: string; amount: number;...
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AdriSolid

Convert JSON Object values to keys in a json array

Input data = [ { "name": "AAA", "uuid": "111", "zone": "A"}, { "name": "BBB", "uuid": "222", &quo...
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UserBSS1

javascript

json

dictionary

reduce

Votes: 0

Answers: 3

Latest Answer

The parts of the output that correspond to the input are all inside a single item in an array, so map inside an array literal. Extract the name property when mapping, and return an object whose key is...
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CertainPerformance

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