Below is an array of dictionaries:
[{name:'v1', count:1}, {name:'v1', count:1}, {name:'v2', count:1}, {name:'v2', count:1}]
I'm looking to sum up the counts for each name and create a new dictionary like this:
[{name:'v1', count:2}, {name:'v2', count:2}]
Utilizing Array.prototype.reduce, Object.entries, and Array.protype.map for the solution:
const data = [{name:'v1', count:1}, {name:'v1', count:1}, {name:'v2', count:1}, {name:'v2', count:1}]
const result = Object.entries(data.reduce(
(acc, { name, count }) => {
acc[name] = count + (acc[name] || 0)
return acc
},
{}
)).map(([name, count]) => ({ name, count }))
console.log(result)Breaking down the solution into separate parts for better comprehension:
const data = [{name:'v1', count:1}, {name:'v1', count:1}, {name:'v2', count:1}, {name:'v2', count:1}]
const r1 = data.reduce(
(acc, { name, count }) => {
acc[name] = count + (acc[name] || 0)
return acc
},
{}
)
console.log(r1)
const r2 = Object.entries(r1)
console.log(r2)
const r3 = r2.map(([name, count]) => ({ name, count }))
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