Sorting objects by property values

by

javascript has the sort function which can take another function as parameter – that second function is used to compare two elements.

Example:

cars = [

    {
        name: "Honda",
        speed: 80
    },

    {
        name: "BMW",
        speed: 180
    },

    {
        name: "Trabi",
        speed: 40
    },

    {
        name: "Ferrari",
        speed: 200
    }
]


cars.sort(function(a, b) { 
    return a.speed - b.speed;
})

for(var i in cars)
    document.writeln(cars[i].name) // Trabi Honda BMW Ferrari

ok, from your comment i see that you’re using the word ‘sort’ in a wrong sense. In programming “sort” means “put things in a certain order”, not “arrange things in groups”. The latter is much simpler – this is just how you “sort” things in the real world

  • make two empty arrays (“boxes”)
  • for each object in your list, check if it matches the criteria
  • if yes, put it in the first “box”
  • if no, put it in the second “box”

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