Clever Geek Handbook

Sorting an array based on the first digit of a property

I am trying to sort an array based on the first digit occurring in the header.

My attempt was replacing non-numeric characters with `` (title.replace (/ \ D / g, ''). It returns me the numbers, but I'm not sure how to sort the array from that point.

So test0 is first followed by test1, test2 and test3.

model = [
  {
    "title": "test3"
  },
  {
    "title": "test1"
  },
  {
    "title": "test2"
  },
  {
    "title": "test0"
  }
];
+3


source to share


3 answers


You can use regex in Javascript function sort

like below.

var model = [
    {
        "title": "test3"
    },
    {
        "title": "test1"
    },
    {
        "title": "test2"
    },
    {
        "title": "test0"
    }
];

Update:



As Danilo Valente said in the comments, if your integer starts with 0

, you need to extract the first 0

from the string. Insofar as02 => 0 

model.sort(function (a, b) {
    //Strips out alpha characters
    a = a.title.replace(/\D/g, '');
    b = b.title.replace(/\D/g, '');

    //sets value of a/b to the first zero, if value beings with zero.
    //otherwise, use the whole integer.
    a = a[0] == '0' ? +a[0] : +a;
    b = b[0] == '0' ? +b[0] : +b;

    return a - b;
});
+5


source 




var model = [{
  "title": "test3"
}, {
  "title": "test1"
}, {
  "title": "test2"
}, {
  "title": "test02"
}, {
  "title": "test0"
}];

// pass a custom sort fn to `.sort()`
var sortedModel = model.sort(function(a, b) {
  // just get the first digit
  return a.title.match(/\d/) - b.title.match(/\d/);
});

console.log(sortedModel);

// [ { title: 'test02' },
//   { title: 'test0' },
//   { title: 'test1' },
//   { title: 'test2' },
//   { title: 'test3' } ]
Run codeHide result


+4


source


Since you only want to sort on the first digit, you can call .sort

with a special function and then use a simple regex to find the first digit:

model.sort(function (a, b) {
    var da = a.title.match(/\d/);
    var db = b.title.match(/\d/);
    return parseInt(da) - parseInt(db);
});
0


source






More articles:


All Articles