this is my data
['aaa','bbb','ccc','ddd','aaa','bbb','eee','ccc','aaa']
the output i want
[
['aaa','aaa','aaa'],
['bbb','bbb'],
['ccc','ccc'],
['ddd'],
['eee']
]
How can I achieve this result?
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1 Answer
This is a pretty simple use for reduce to group an array, and Object.values to get the result you wanted.
const input = ['aaa','bbb','ccc','ddd','aaa','bbb','eee','ccc','aaa']
const output = Object.values(input.reduce( (acc,i) => {
acc[i] ??= []
acc[i].push(i);
return acc;
},{}))
console.log(output);
1 Comment
Andy
You might want to link to some documentation particularly to "logical nullish assignment" which isn't that well known.
