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- function pad(n) {
- return n.toString().length === 1 ? `0${n}` : n;
- }
- function serializeActivities(arr) {
- const obj = {};
- for (let i = 0, l = arr.length; i < l; i++) {
- const thisDate = arr[i].updatedAt;
- const day = pad(thisDate.getDate());
- const month = pad(thisDate.getMonth() + 1);
- const year = thisDate.getFullYear();
- const key = [year, day, month].join('-');
- obj[key] = obj[key] || 0;
- obj[key]++;
- }
- return obj;
- }
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