var array = [{"bad": "something", "good":"something"},{"bad":"something", "good":"something"},...];

for (var i = 0, len = array.length; i < len; i++) {
    delete array[i].bad;
}

array.forEach(function(v){ delete v.bad });

function Cons(g) { this.good = g; }
Cons.prototype.bad = "something common";
var array = [new Cons("something 1"), new Cons("something 2"), …];

delete Cons.prototype.bad;

array.map(function(item) {
    delete item.bad;
    return item;
});

var strippedRows = _.map(rows, function (row) {
    return _.omit(row, ['bad', 'anotherbad']);
});

const newArray = array.map(({dropAttr1, dropAttr2, ...keepAttrs}) => keepAttrs)