Use Underscore.js to remove object from array based on property

You don't even really need underscore for this, since there's the filter method as of ECMAScript 5:

var newArr = oldArr.filter(function(o) { return o.weight !== 0; });

But if you want to use underscore (e.g. to support older browsers that do not support ECMAScript 5), you can use its filter method:

var newArr = _.filter(oldArr, function(o) { return o.weight !== 0; });

filter should do the job

_.filter(data, function(item) { return !!item.weight; });

the !! is used to cast the item.weight into a boolean value, where NULL, false or 0 will make it false, and filter it out.

This should do it:

_.filter(myArray, function(o){ return o.weight; });