Sorting Array of objects with multiple criterias

Question

This is my array:

let a = [
    {
        IsGroup: true,
        Name: "Antonia Doyle"
    },
    {
        IsGroup: false,
        Name: "Dana Gray"
    },
    {
        IsGroup: false,
        Name: "Amber Banks"
    },
    {
        IsGroup: false,
        Name: "Geoff Neal"
    },
    {
        IsGroup: true,
        Name: "Nina Hartley"
    },
    {
        IsGroup: false,
        Name: "Elizabeth Warren"
    },
    {
        IsGroup: false,
        Name: "Ghengis Khan"
    },
    {
        IsGroup: true,
        Name: "Masta Razz"
    }
];

I can't see to sort it by IsGroup and then Name. However, it doesn't seem to be working. My code so far:

let b = [];
b = a;

b.sort(byGroupThenName);

function byGroupThenName(a, b) {
    return b.IsGroup - a.IsGroup || (a.Name - b.Name ? -1 : 1);
}

So you want to group your array by isGroup field and then sort the groups. is my understanding right? — Ms.Tamil
– Ms.Tamil, Commented Nov 24, 2020 at 13:44
FYI Subtracting two non-numeric strings (!) always produces NaN, regardless of the values of the non-numeric strings. — Peter B
– Peter B, Commented Nov 24, 2020 at 13:45
Subtracting strings does not make sense. It should be a.Name.localeCompare(b.Name), which will give the exact kind of result you need for sorting. — Pointy
– Pointy, Commented Nov 24, 2020 at 13:45

Saurabh · Accepted Answer · 2020-11-24 14:27:14Z

2

Use the dynamicSort() function which takes two params property and order (asc & desc)

let a = [ { IsGroup: true , Name: "Antonia Doyle" },
      { IsGroup: false, Name: "Dana Gray" },
      { IsGroup: false, Name: "Amber Banks" },
      { IsGroup: false, Name: "Geoff Neal" },
      { IsGroup: true , Name: "Nina Hartley" },
      { IsGroup: false, Name: "Elizabeth Warren" },
      { IsGroup: false, Name: "Ghengis Khan" },
      { IsGroup: true , Name: "Masta Razz" } ]

const dynamicSort = (property, order) => {
  let sortOrder = 1
  if (order === 'desc') {
    sortOrder = -1
  }
  return function(a, b) {
    // a should come before b in the sorted order
    if (a[property] < b[property]) {
      return -1 * sortOrder
      // a should come after b in the sorted order
    } else if (a[property] > b[property]) {
      return 1 * sortOrder
      // a and b are the same
    } else {
      return 0 * sortOrder
    }
  }
}

const sortedArr = a.sort(dynamicSort('IsGroup','desc'))

console.log(sortedArr)

edited Nov 24, 2020 at 14:27

answered Nov 24, 2020 at 13:59

Saurabh

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5 Comments

Riza Khan Over a year ago

But we cannot pass another property(ie Name)?

Saurabh Over a year ago

you can pass any property to it

Riza Khan Over a year ago

Sorry let me rephrase, can I pass more then one property to it?

Saurabh Over a year ago

No, just one prop

Riza Khan Over a year ago

In this case, I'm going to mark Slai's answer as the correct answer(it is my main requirement). However, +1 for a great suggestion. Thank you.

Slai · Accepted Answer · 2020-11-24 13:52:09Z

1

localeCompare can be used to compare strings :

let arr = [ { IsGroup: true , Name: "Antonia Doyle" },
          { IsGroup: false, Name: "Dana Gray" },
          { IsGroup: false, Name: "Amber Banks" },
          { IsGroup: false, Name: "Geoff Neal" },
          { IsGroup: true , Name: "Nina Hartley" },
          { IsGroup: false, Name: "Elizabeth Warren" },
          { IsGroup: false, Name: "Ghengis Khan" },
          { IsGroup: true , Name: "Masta Razz" } ]
    
arr.sort((a, b) => b.IsGroup - a.IsGroup || a.Name.localeCompare(b.Name))

console.log( JSON.stringify(arr).replace(/},/g, '},\n ') )

answered Nov 24, 2020 at 13:52

Slai

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