Suppose we have an array that contains some dates like this −
const arr = [ [ '02/13/2015', 0.096 ], [ '11/15/2013', 0.189 ], [ '05/15/2014', 0.11 ], [ '12/13/2013', 0.1285 ], [ '01/15/2013', 0.12 ], [ '01/15/2014', 0.11 ], [ '02/14/2014', 0.11 ], [ '03/14/2014', 0.11 ], [ '01/15/2015', 0.096 ], [ '07/15/2015', 0.096 ], [ '04/15/2013', 0.12 ], [ '04/15/2014', 0.11 ], [ '05/15/2013', 0.12 ], [ '06/14/2013', 0.12 ], [ '06/16/2014', 0.11 ], [ '07/15/2013', 0.12 ], [ '07/15/2014', 0.11 ], [ '03/16/2015', 0.096 ] ];
We are required to write a JavaScript function that takes in one such array and sorts the array in ascending order according to the dates in each array.
Example
Following is the code −
const arr = [
[ '02/13/2015', 0.096 ],
[ '11/15/2013', 0.189 ],
[ '05/15/2014', 0.11 ],
[ '12/13/2013', 0.1285 ],
[ '01/15/2013', 0.12 ],
[ '01/15/2014', 0.11 ],
[ '02/14/2014', 0.11 ],
[ '03/14/2014', 0.11 ],
[ '01/15/2015', 0.096 ],
[ '07/15/2015', 0.096 ],
[ '04/15/2013', 0.12 ],
[ '04/15/2014', 0.11 ],
[ '05/15/2013', 0.12 ],
[ '06/14/2013', 0.12 ],
[ '06/16/2014', 0.11 ],
[ '07/15/2013', 0.12 ],
[ '07/15/2014', 0.11 ],
[ '03/16/2015', 0.096 ]
];
const sortByDate = arr => {
const sorter = (a, b) => {
return new Date(a[0]) - new Date(b[0]);
};
arr.sort(sorter);
};
sortByDate(arr);
console.log(arr);Output
This will produce the following output on console −
[ [ '01/15/2013', 0.12 ], [ '04/15/2013', 0.12 ], [ '05/15/2013', 0.12 ], [ '06/14/2013', 0.12 ], [ '07/15/2013', 0.12 ], [ '11/15/2013', 0.189 ], [ '12/13/2013', 0.1285 ], [ '01/15/2014', 0.11 ], [ '02/14/2014', 0.11 ], [ '03/14/2014', 0.11 ], [ '04/15/2014', 0.11 ], [ '05/15/2014', 0.11 ], [ '06/16/2014', 0.11 ], [ '07/15/2014', 0.11 ], [ '01/15/2015', 0.096 ], [ '02/13/2015', 0.096 ], [ '03/16/2015', 0.096 ], [ '07/15/2015', 0.096 ] ]