Question

0

Javascript sort array of objects by a boolean property

rated 0 times [ 6] [ 6] / answers: 1 / hits: 185767 / 11 Years ago, sun, june 30, 2013, 12:00:00

See edit at end for actual problem.

Ok, I have this scenario:

a = [false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false]

Then if I do this:

a.sort(function(a,b){return !a && b});

It gives me this:

[false, false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, false, true, false, false, false, false, false, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false]

It's sorta doing a sort... but not quite... :(

How do I sort this array?

EDIT:

If you are wondering why I did not use just a.sort() is because my actual array is of objects, not a plain array like the one I posted. The real one has elements that look like [{xx:true},{xx:false},...]

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

warren

Add To Favorites

Follow

Total Points: 679

Total Questions: 115

Total Answers: 78

Location: Antigua and Barbuda

Member since Sat, Apr 24, 2021

3 Years ago

answered 11 Years ago wilson · Accepted Answer

a = [false, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, true, false, true, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false, false];

    

    

    a.sort(function(x, y) {

        // true values first

        return (x === y)? 0 : x? -1 : 1;

        // false values first

        // return (x === y)? 0 : x? 1 : -1;

    });

    

    console.log(a);

You must return 0 when a and b both have the same value, -1 if a is true and 1 otherwise.