Getting a particular year from a Date array in React is simple - you can use built

Question

Getting a particular year from a Date array in React is simple - you can use built

I am working with a dates array and need to implement a function that can filter out all the dates from either 2014 or 2015 depending on user input.

I attempted using substring() method, but it returned an array of the desired 2014 dates along with 2 undefined values. How can I modify my approach to get only the dates from 2014?

const datefunc = () => {
  const date = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4']

  const dates = date.filter((d) => {
    return d.substring(0, 4) === '2014';
  })

  console.log(dates)
}

datefunc()

javascript

Answer 1

Answer №1

Array.map processes each value in an array => when date.map is executed with the condition to only return dates starting with '2014', all other values in the array will be undefined.

Array.filter refines the elements in an array based on a condition => upon using date.filter, elements that do not meet the condition will be excluded from the resulting array.

To make your code work, you can update it like this:

const datefunc = () => {
  const date = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4'];

  const dates = date.filter((d) => d.substring(0, 4) === '2014');

  // Another option
  // const dates = date.filter((d) => d.startsWith('2014'));

  console.log(dates);
  
}

datefunc();

If your dates are not consistently formatted but valid date strings, you can convert them to Date objects and then filter them as follows:

const datefunc = () => {
  const date = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4'];

  const dates = date
    .map((d) => new Date(d))
    .filter((d) => d.getFullYear() === 2014);

  console.log(dates);
}

datefunc();

Answer 2

Array.map processes each value in an array => when date.map is executed with the condition to only return dates starting with '2014', all other values in the array will be undefined.

Array.filter refines the elements in an array based on a condition => upon using date.filter, elements that do not meet the condition will be excluded from the resulting array.

To make your code work, you can update it like this:

const datefunc = () => {
  const date = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4'];

  const dates = date.filter((d) => d.substring(0, 4) === '2014');

  // Another option
  // const dates = date.filter((d) => d.startsWith('2014'));

  console.log(dates);
  
}

datefunc();

If your dates are not consistently formatted but valid date strings, you can convert them to Date objects and then filter them as follows:

const datefunc = () => {
  const date = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4'];

  const dates = date
    .map((d) => new Date(d))
    .filter((d) => d.getFullYear() === 2014);

  console.log(dates);
}

datefunc();

Answer 3

Answer №2

const dateFunction = () => {
  const datesArr = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4']

  const filteredDates = datesArr.filter((date) => date.substring(0, 4) === '2014')

  console.log(filteredDates)
}

dateFunction()

Answer 4

const dateFunction = () => {
  const datesArr = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4']

  const filteredDates = datesArr.filter((date) => date.substring(0, 4) === '2014')

  console.log(filteredDates)
}

dateFunction()

Answer 5

Answer №3

A more efficient approach would involve converting the string to a date format. It's also important to note that using the map method may not be suitable in this scenario as it doesn't handle filtering dates effectively. Even if no values are returned for false conditions, the result will still be undefined. This is why those undefined values are present.

const filterDates = () => {
  const datesArray = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4']
  const targetYears = [2014, 2015]; // Specify the years to filter on here
  const filteredDates = datesArray.filter((date) => {
    const currentYear = new Date(date).getFullYear();
    return targetYears.includes(currentYear);
  })

  console.log(filteredDates)
}

filterDates()

Answer 6

A more efficient approach would involve converting the string to a date format. It's also important to note that using the map method may not be suitable in this scenario as it doesn't handle filtering dates effectively. Even if no values are returned for false conditions, the result will still be undefined. This is why those undefined values are present.

const filterDates = () => {
  const datesArray = ['2014-4-4', '2014-5-4', '2015-4-4', '2015-3-4']
  const targetYears = [2014, 2015]; // Specify the years to filter on here
  const filteredDates = datesArray.filter((date) => {
    const currentYear = new Date(date).getFullYear();
    return targetYears.includes(currentYear);
  })

  console.log(filteredDates)
}

filterDates()

Answer 7

Answer №4

To select specific years, simply customize the filteredYears array as needed.

const datefunc = () => {
  const dates = ['2016-6-6', '2017-7-7', '2018-8-8', '2019-9-9']
  const filteredYears = [2017, 2018];
  const filteredDates = dates.filter(date => filteredYears.includes(new Date(date).getFullYear()));

  console.log(filteredDates)
}

datefunc()

Answer 8

To select specific years, simply customize the filteredYears array as needed.

const datefunc = () => {
  const dates = ['2016-6-6', '2017-7-7', '2018-8-8', '2019-9-9']
  const filteredYears = [2017, 2018];
  const filteredDates = dates.filter(date => filteredYears.includes(new Date(date).getFullYear()));

  console.log(filteredDates)
}

datefunc()

Answer 9

Answer №5

One approach is to start by converting the datestring into a date type, and then utilize the "filter()" method to extract dates from a specific year. This process can help you achieve your desired outcome!

const dates = ["2014-4-4", "2014-5-4", "2015-4-4", "2015-3-4"];
let convertedDates = [];

function getYearList() {
    dates.forEach(date => {
      convertedDates.push(new Date(date));
    });

    convertedDates = convertedDates.filter(
      date => date.getFullYear() === 2014
    );
    console.log(convertedDates);
}

Answer 10

One approach is to start by converting the datestring into a date type, and then utilize the "filter()" method to extract dates from a specific year. This process can help you achieve your desired outcome!

const dates = ["2014-4-4", "2014-5-4", "2015-4-4", "2015-3-4"];
let convertedDates = [];

function getYearList() {
    dates.forEach(date => {
      convertedDates.push(new Date(date));
    });

    convertedDates = convertedDates.filter(
      date => date.getFullYear() === 2014
    );
    console.log(convertedDates);
}

Answer 11

Answer №6

function filterDatesByYear(arr, yr) {
  return arr.filter((date) => date.includes(yr));
}

const datesArray = ["2020-4-10", "2020-5-15", "2021-2-28", "2021-3-20"];
console.log(filterDatesByYear(datesArray, "2020"));

Answer 12

function filterDatesByYear(arr, yr) {
  return arr.filter((date) => date.includes(yr));
}

const datesArray = ["2020-4-10", "2020-5-15", "2021-2-28", "2021-3-20"];
console.log(filterDatesByYear(datesArray, "2020"));

Getting a particular year from a Date array in React is simple - you can use built

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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