sort array of date-months in ascending order of type string [duplicate]

Question

var months = ["April 2021","March 2021", "May 2021", "April 2020"];

how to get ascending order of these months of type string.

let monthArray = ["January", "Febraury", "March", "April", "May", "June",
    "July", "August", "September", "October", "November", "December"];

let preparedArray = [];

months.forEach(month => {
    let mntSplit = month.split(' ');
    preparedArray.push({year: mntSplit[1], month: mntSplit[0] });
});

how to proceed to asc sort please help

resultExpected = ["April 2020","March 2021","April 2021","May 2021"] like this — Shaik Habeeb
– Shaik Habeeb, Commented Jun 1, 2021 at 12:55

User863 · Accepted Answer · 2021-06-07 09:59:46Z

3

Using sort() and Date() constructor

var months = ["April 2021", "March 2021", "May 2021", "April 2020"]

var sorted = months.sort((a, b) => new Date(a) - new Date(b))

console.log(sorted)

Update: (not working in firefox)

var months = ["April 2021", "March 2021", "May 2021", "April 2020"]

var sorted = months.sort((a, b) => new Date('01 ' + a) - new Date('01 ' + b))

console.log(sorted)

edited Jun 7, 2021 at 9:59

answered Jun 1, 2021 at 12:52

User863

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3 Comments

Shaik Habeeb Over a year ago

not working in firefox browser

User863 Over a year ago

@ShaikHabeeb Sorry I never knew that. It's due to the date missing from the list.

Edson Filho Over a year ago

hi, Can you explain to me what changed with the parameters ('01 ' + a) and ('01 ' + a) inside the new Data instance?

stacj · Accepted Answer · 2021-06-01 12:56:10Z

0

If you want to keep your code you can use this:

var months = ["April 2021","March 2021", "May 2021", "April 2020"];
let monthArray = ["January", "Febraury", "March", "April", "May", "June",
    "July", "August", "September", "October", "November", "December"];

months = months.sort((a,b)=>{
  const [monthA, yearA] = a.split(' '),
        [monthB, yearB] = b.split(' ');
  if (yearA === yearB)
    return monthArray.indexOf(monthA) - monthArray.indexOf(monthB);
  return +yearA - +yearB
})

console.log(months)

Otherwise sort by using new Date():

months.sort((a, b) => new Date(a) - new Date(b))

answered Jun 1, 2021 at 12:56

stacj

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1 Comment

Shaik Habeeb Over a year ago

months.sort((a, b) => new Date(a) - new Date(b)) it is not working in firefox

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