use JavaScript map reduce to remove items from an array

dictionary, javascript, jquery, reduce

Solution

You mean `.filter`?

var after = before.filter(function (item) {
   return item.keep;
});

Then you can still `.map` it if you want/need to.

Problem

I have a JavaScript example with map reduce to remove items from an array, after transforming them. Is there a simpler method to achieve this as it seems a bit complicated I put it in a JSFiddle here and here is the map reduce part: ``` var after = before.map(function (item) { if (item.keep) { return { z: item.a }; } else { return undefined; } }).reduce(function (prev, item) { if (item) { if ($.isArray(prev)) { prev.push(item); return prev; } else if (prev) { return [prev, item]; } else { return [item]; } } else { if ($.isArray(prev)) { return prev; } else if (prev) { return [prev]; } else { return prev; } } }); ```

Original source