If I have a an array of objects called filteredList and a function such as :

function    buildList(filteredList, p1, p2, p3) {
    var resultList = [];

    for (var i =0; i < filteredList.length; i++) {
        if (filteredList[i].type === 'global' && filteredList[i].p1 === p1 && filteredList[i].p2 === p2 && filteredList[i].p3 === p3)
            resultList.push(filteredList[i]);
    }

    return resultList;
}

What would be the performance difference if instead of looping through my array like I do, I would do something like : filteredList.filter(rebuildList)

rebuildList being a function checking the same conditions than buildList

Would it do the same ? (Looping through each element)

Can you think of a more optimized and efficient way to do it ? I'm calling a function like buildList many times in my project and it consumes a great amount of time.

If I have a an array of objects called filteredList and a function such as :

function    buildList(filteredList, p1, p2, p3) {
    var resultList = [];

    for (var i =0; i < filteredList.length; i++) {
        if (filteredList[i].type === 'global' && filteredList[i].p1 === p1 && filteredList[i].p2 === p2 && filteredList[i].p3 === p3)
            resultList.push(filteredList[i]);
    }

    return resultList;
}

What would be the performance difference if instead of looping through my array like I do, I would do something like : filteredList.filter(rebuildList)

rebuildList being a function checking the same conditions than buildList

Would it do the same ? (Looping through each element)

Can you think of a more optimized and efficient way to do it ? I'm calling a function like buildList many times in my project and it consumes a great amount of time.

• javascript
• performance
• object
• optimization
• filter

• What is filteredList? It is a array or object. It is an object then performance will be fasted. – SK. Commented Jul 16, 2015 at 11:45

1 Answer 1

You can use the Array.prototype.filter method. Example ing soon

Regarding performance you should read here: Fastest way to find an item in a JavaScript Array