How to sort array of strings based on a contained number?

Question

I have an array with strings like this:

"1115.49|Onroll|Paiporta|/v2/networks/onroll-paiporta"
"1767.92|Göteborg|Göteborg|/v2/networks/goeteborg"
"190.4|ARbike|Arezzo|/v2/networks/arbike"
"201.36|JesinBici|Jesi|/v2/networks/jesinbici"
"403.59|Venezia|Venezia|/v2/networks/venezia"
"395.07|Mantova|Mantova|/v2/networks/mantova"

the first value is a distance, I would like to sort the array based on that distance, how can I do?

Everything I've tried does not work, I would that 1000 come after 200 not before!

thanks!

Ben · Accepted Answer · 2014-07-20 11:15:09Z

2

You can do something like this:

yourArray.sort(function (a, b) {
    var aNum = +a.substring(0, a.indexOf('|'));
    var bNum = +b.substring(0, b.indexOf('|'));
    if (aNum > bNum) return 1;
    if (aNum < bNum) return -1;
    return 0;
});

which will return an array in the ascending order you wanted.

edited Jul 20, 2014 at 11:15

answered Jul 20, 2014 at 10:39

Ben

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4 Comments

thefourtheye Over a year ago

return +a.substring(0, a.indexOf('|')) - +b.substring(0, a.indexOf('|')) should be enough.

Andref Over a year ago

thanks! but I keep getting: Uncaught TypeError: undefined is not a function where am I wrong?

Karl Over a year ago

@Andref replace yourArray with your array.

Andref Over a year ago

There was a problem creating the array, now it works, thanks to all!

Tesseract · Accepted Answer · 2014-07-20 10:54:20Z

0

If you add a sortBy function to Array.prototype you can do things like that more easily.

Array.prototype.sortBy = function(f) {
  this.sort(function(a, b) {
    a = f(a); b = f(b);
    if(a > b) return 1;
    if(a < b) return -1;
    return 0;
  });
}

and then you can write

array.sortBy(function(s) { return +s.split("|")[0]; });

answered Jul 20, 2014 at 10:54

Tesseract

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