destructuring - Extract day, month, year from a YYYY-DD-MM string in Javascript - Stack Overflow

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I am finding the best solution for extracting day, month, year from string with YYYY-DD-MM in Javascript:

Extract from:

2019-25-01

To object:

{ day: 25, month: 01, year: 2019 }

What is the best way to do it. Thank in advance!

I am finding the best solution for extracting day, month, year from string with YYYY-DD-MM in Javascript:

Extract from:

2019-25-01

To object:

{ day: 25, month: 01, year: 2019 }

What is the best way to do it. Thank in advance!

• javascript
• destructuring

Share Improve this question Follow edited Sep 13, 2020 at 21:38 Nina Scholz 387k2626 gold badges363363 silver badges412412 bronze badges asked Jan 25, 2019 at 10:40 KitKitKitKit 9,5131515 gold badges6464 silver badges8989 bronze badges 4

• 3 Surely you have tried some coding already to solve this problem. Please show us what you have tried so far. – Tim Biegeleisen Commented Jan 25, 2019 at 10:42
• 1 @Cid: This is not one of the supported formats for Date.parse; so, not a dupe (as it requires further steps). – Amadan Commented Jan 25, 2019 at 10:43
• @Amadan ah, true, thanks for pointing me that. I didn't notice the date is in a stupid format, un-sortable and so on. – Cid Commented Jan 25, 2019 at 10:45
• @Cid: Stupid or not, it's official in three countries. – Amadan Commented Jan 25, 2019 at 10:45

Add a comment  | 

7 Answers 7

Sorted by: Reset to default 21

You could split, destructure and return a new object.

const getDate = string => (([year, day, month]) => ({ day, month, year }))(string.split('-'));

console.log(getDate('2019-25-01'));

I'd use a regular expression to match each number sequence, map the array of matched strings to numbers, destructure into variables, then create an object from it:

const [year, day, month] = '2019-25-01'
  .match(/\d+/g)
  .map(Number);
const obj = { day, month, year };
console.log(obj);

Note that numbers cannot have leading zeros. If you want the month to have a leading zero, use a string instead (just remove the .map(Number)).

This is a pretty short and fast solution that will only work for that format and in ES6

function getJsonDate(text) {
  var {0: year, 1: day, 2: month } = text.split("-");
  return { day, month, year};
}
console.log(getJsonDate("2019-25-1"));

If you need the fields to be numbers then you can add a map, like so:

function toNumber(text) {
  text = text - 0;
  return isNaN(text) ? 0 : text;
}
function getJsonDate(text) {
  var {0: year, 1: day, 2: month } = text.split("-").map(toNumber);
  return { day, month, year};
}
console.log(getJsonDate("2019-25-1"));

You can split()to do it

var value = "2019-25-01";
var year = value.substring(0,4);
var day = value.substring(5,7);
var month = value.substring(8,10);
var str = "{day:" + day + ",month:" + month + ",year:" + year + "}";
console.log(str);

Use .split().

let date = "2019-25-01"
let dateArr = date.split('-')
let obj = {
  day: dateArr[1],
  month: dateArr[2],
  year: dateArr[0]
}
console.log(obj)

For JSON like structure

d="2019-25-01";
x=d.split("-");
json="{ day: "+x[1]+", month: "+x[2]+", year: "+x[0]+" }";
>>"{ day: 25, month: 01, year: 2019 }"

Here you have one approach that don't need to do the mapping str -> array -> object, it will convert the string directly to object and can be used also for a more generalized date with time. It is based on the replacement function that can be used on String::replace()

const dateStr1 = "2019-25-01";
const dateMap1 = ["year", "day", "month"];
const dateStr2 = "2019-25-01 17:07:56";
const dateMap2 = ["year", "day", "month", "hour", "minute", "second"];

const splitDate = (str, map) =>
{
    let obj = {}, i = 0;
    str.replace(/\d+/g, (match) => obj[[map[i++] || i - 1]] = match);

    return obj;
}

console.log(splitDate(dateStr1, dateMap1));
console.log(splitDate(dateStr2, dateMap2));

Another way that is strictly related to your date format could be next one:

const strDate = "2019-25-01";

const splitDate = (str) =>
{
    let [date, year, day, month] = str.match(/(\d+)-(\d+)-(\d+)/);
    return {year, month, day};
}

console.log(splitDate(strDate));

I am finding the best solution for extracting day, month, year from string with YYYY-DD-MM in Javascript:

Extract from:

2019-25-01

To object:

{ day: 25, month: 01, year: 2019 }

What is the best way to do it. Thank in advance!

I am finding the best solution for extracting day, month, year from string with YYYY-DD-MM in Javascript:

Extract from:

2019-25-01

To object:

{ day: 25, month: 01, year: 2019 }

What is the best way to do it. Thank in advance!

• javascript
• destructuring

Share Improve this question Follow edited Sep 13, 2020 at 21:38 Nina Scholz 387k2626 gold badges363363 silver badges412412 bronze badges asked Jan 25, 2019 at 10:40 KitKitKitKit 9,5131515 gold badges6464 silver badges8989 bronze badges 4

• 3 Surely you have tried some coding already to solve this problem. Please show us what you have tried so far. – Tim Biegeleisen Commented Jan 25, 2019 at 10:42
• 1 @Cid: This is not one of the supported formats for Date.parse; so, not a dupe (as it requires further steps). – Amadan Commented Jan 25, 2019 at 10:43
• @Amadan ah, true, thanks for pointing me that. I didn't notice the date is in a stupid format, un-sortable and so on. – Cid Commented Jan 25, 2019 at 10:45
• @Cid: Stupid or not, it's official in three countries. – Amadan Commented Jan 25, 2019 at 10:45

Add a comment  | 

7 Answers 7

Sorted by: Reset to default 21

You could split, destructure and return a new object.

const getDate = string => (([year, day, month]) => ({ day, month, year }))(string.split('-'));

console.log(getDate('2019-25-01'));

I'd use a regular expression to match each number sequence, map the array of matched strings to numbers, destructure into variables, then create an object from it:

const [year, day, month] = '2019-25-01'
  .match(/\d+/g)
  .map(Number);
const obj = { day, month, year };
console.log(obj);

Note that numbers cannot have leading zeros. If you want the month to have a leading zero, use a string instead (just remove the .map(Number)).

This is a pretty short and fast solution that will only work for that format and in ES6

function getJsonDate(text) {
  var {0: year, 1: day, 2: month } = text.split("-");
  return { day, month, year};
}
console.log(getJsonDate("2019-25-1"));

If you need the fields to be numbers then you can add a map, like so:

function toNumber(text) {
  text = text - 0;
  return isNaN(text) ? 0 : text;
}
function getJsonDate(text) {
  var {0: year, 1: day, 2: month } = text.split("-").map(toNumber);
  return { day, month, year};
}
console.log(getJsonDate("2019-25-1"));

You can split()to do it

var value = "2019-25-01";
var year = value.substring(0,4);
var day = value.substring(5,7);
var month = value.substring(8,10);
var str = "{day:" + day + ",month:" + month + ",year:" + year + "}";
console.log(str);

Use .split().

let date = "2019-25-01"
let dateArr = date.split('-')
let obj = {
  day: dateArr[1],
  month: dateArr[2],
  year: dateArr[0]
}
console.log(obj)

For JSON like structure

d="2019-25-01";
x=d.split("-");
json="{ day: "+x[1]+", month: "+x[2]+", year: "+x[0]+" }";
>>"{ day: 25, month: 01, year: 2019 }"

Here you have one approach that don't need to do the mapping str -> array -> object, it will convert the string directly to object and can be used also for a more generalized date with time. It is based on the replacement function that can be used on String::replace()

const dateStr1 = "2019-25-01";
const dateMap1 = ["year", "day", "month"];
const dateStr2 = "2019-25-01 17:07:56";
const dateMap2 = ["year", "day", "month", "hour", "minute", "second"];

const splitDate = (str, map) =>
{
    let obj = {}, i = 0;
    str.replace(/\d+/g, (match) => obj[[map[i++] || i - 1]] = match);

    return obj;
}

console.log(splitDate(dateStr1, dateMap1));
console.log(splitDate(dateStr2, dateMap2));

Another way that is strictly related to your date format could be next one:

const strDate = "2019-25-01";

const splitDate = (str) =>
{
    let [date, year, day, month] = str.match(/(\d+)-(\d+)-(\d+)/);
    return {year, month, day};
}

console.log(splitDate(strDate));

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