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How to sort date array in JavaScript
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 ] ]
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