I am looking for a way to analyze a list of dates that looks something like this:
[ "2020-08-20", "2020-08-20", "2020-08-21", "2020-08-24", "2020-08-25", "2020-08-25", "2020-08-25", ] How can I determine the count of duplicate items in the list?
For example:
{date: "2020-08-20", count: 2},
{date: "2020-08-21", count: 1},
{date: "2020-08-24", count: 1},
{date: "2020-08-25", count: 3},
Any assistance would be greatly appreciated. Thank you!
let datesArray = [ "2021-09-15", "2021-09-16", "2021-09-16", "2021-09-17", "2021-09-18", "2021-09-18", "2021-09-19" ]
const resultArray = []
datesArray.forEach(date => {
const idx = resultArray.findIndex(r => r.date === date)
if (idx === -1) {
resultArray.push({
date: date,
count: 1
})
} else {
resultArray[idx].count++;
}
})
console.log(resultArray)To tally the occurrences, utilize the array reduce function. Iterate through the string array and calculate the frequencies. Finally, display the outcome using the Object.values function.
const data = [
'2020-08-20',
'2020-08-20',
'2020-08-21',
'2020-08-24',
'2020-08-25',
'2020-08-25',
'2020-08-25',
];
const result = data.reduce((prev, curr) => {
const previous = prev;
if (!previous[curr]) previous[curr] = { date: curr, count: 1 };
else previous[curr] = { date: curr, count: previous[curr].count + 1 };
return previous;
}, {});
console.log(Object.values(result));One way to achieve this is by using the following code snippet:
const datesArray = [ "2020-08-20", "2020-08-20", "2020-08-21", "2020-08-24", "2020-08-25", "2020-08-25", "2020-08-25", ]
const result = datesArray
.filter((date, index) => datesArray.indexOf(date) == index)
.map(date => ({
date: date,
count: datesArray.filter(currentDate => currentDate === date).length
}))
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