Steps for sorting an array of objects and selecting the first element1. Create an array of

Question

Steps for sorting an array of objects and selecting the first element1. Create an array of

Is it possible to sort an array of objects in JavaScript while specifying the first element? Here's an example:

Initial data in JavaScript

{title: 'test 1', text: 'aa'},
{title: 'test 2', text: 'bb'},
{title: 'display first', text: 'this is an example'},
{title: 'test 4', text: 'dd'}

After sorting

var elementToDisplayFirst = "display first";

{title: 'display first', text: 'this is an example'},
{title: 'test 1', text: 'aa'},
{title: 'test 2', text: 'bb'},
{title: 'test 4', text: 'dd'}

Thank you!

javascript typescript

Answer 1

Answer №1

Implement a custom sorting approach

var arr = [{
    title: 'Fuchsia',
    text: 'paniculata'
  },
  {
    title: 'Panthera',
    text: 'leo'
  },
  {
    title: 'Canis',
    text: 'lupus'
  },
  {
    title: 'display first',
    text: 'Forrest Gump'
  },
  {
    title: 'Felis',
    text: 'silvestris'
  }
]

arr.sort(function(a, b) {
  if (a.title === 'display first') {
    return -1
  } else if (b.title === 'display first') {
    return 1
  } else return  a.title < b.title ? -1 : a.title > b.title ? 1 : 0;
})

console.log(arr);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

Implement a custom sorting approach

var arr = [{
    title: 'Fuchsia',
    text: 'paniculata'
  },
  {
    title: 'Panthera',
    text: 'leo'
  },
  {
    title: 'Canis',
    text: 'lupus'
  },
  {
    title: 'display first',
    text: 'Forrest Gump'
  },
  {
    title: 'Felis',
    text: 'silvestris'
  }
]

arr.sort(function(a, b) {
  if (a.title === 'display first') {
    return -1
  } else if (b.title === 'display first') {
    return 1
  } else return  a.title < b.title ? -1 : a.title > b.title ? 1 : 0;
})

console.log(arr);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 3

Answer №2

To achieve a descending order based on the boolean values of true (1) and false (0), you can verify if the title matches the desired string and then calculate the inverted delta between them.

var array = [{ title: 'test 1', text: 'aa' }, { title: 'test 2', text: 'bb' }, { title: 'display first', text: 'this is an example' }, { title: 'test 4', text: 'dd' }]
    first = "display first";
    
array.sort(({ title: a }, { title: b }) => 
    (b === first) - (a === first) ||
    a > b || -(a < b)
);

console.log(array);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 4

To achieve a descending order based on the boolean values of true (1) and false (0), you can verify if the title matches the desired string and then calculate the inverted delta between them.

var array = [{ title: 'test 1', text: 'aa' }, { title: 'test 2', text: 'bb' }, { title: 'display first', text: 'this is an example' }, { title: 'test 4', text: 'dd' }]
    first = "display first";
    
array.sort(({ title: a }, { title: b }) => 
    (b === first) - (a === first) ||
    a > b || -(a < b)
);

console.log(array);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Steps for sorting an array of objects and selecting the first element1. Create an array of

Answer №1

Answer №2

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