Why does lodash sorting reverse in an array?

Question

I'm using lodash, and here's some sample code:

var stuff = [{a: 100}, {a: 90}];

var res1 = _.sortBy(stuff, function(st) {
    return [st.a];
});

var res2 = _.sortBy(stuff, function(st) {
    return st.a;
});



console.log(res1);
console.log(res2);

This returns:

[{a: 90}, {a: 100}]
[{a: 100}, {a: 90}]

Why does it switch when an array is returned?

JJJ · Accepted Answer · 2016-11-21 16:46:10Z

4

The sorting callback doesn't expect an array to be returned (why would it?) so it implicitly converts it to a string. Strings are sorted in alphabetical order. In this specific case, 9 is greater than 1, therefore "90" is greater than "100".

answered Nov 21, 2016 at 16:46

JJJ

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3 Comments

Shamoon Over a year ago

How would I do sort by multiple columns then?

JJJ Over a year ago

I had a feeling this would be an XY problem. That's a different question, but you would pass an array of sorting functions to _.sortBy(), one for each column.

stasovlas Over a year ago

@Shamoon check my answer

stasovlas · Accepted Answer · 2016-11-21 17:38:24Z

1

sort by multiple columns

_.sortBy(data, ['key1', 'key2']);

answered Nov 21, 2016 at 17:38

stasovlas

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