Method sum documentation
Returns the sum of the given property or function for the array's elements matching the filter.
Example
```javascript
let invited = [
{name: "Robert De Niro", attendees: 2, confirmed: true},
{name: "Al Pacino", attendees: 1, confirmed: false},
{name: "James Caan", attendees: 4, confirmed: false},
{name: "Harvey Keitel", attendees: 5, confirmed: true}
];
// No filter
bbn.fn.sum(invited, "attendees");
// 12
// Filter
bbn.fn.sum(invited, "attendees", {confirmed: true});
// 7
```
Example
```javascript
let cart = [
{article: "Toothpaste", price: 2.50, quantity: 1},
{article: "Toothbrush", price: 6, quantity: 2},
{article: "Banana", price: 0.50, quantity: 3},
{article: "T-shirt", price: 14, quantity: 3}
];
bbn.fn.sum(cart, a => a.price * a.quantity);
// 58
// Only the items with a quantity equal to 3
bbn.fn.sum(cart, a => a.price * a.quantity, {quantity: 3});
// 43.5
```
Returns the sum of the given property or function for the array's elements matching the filter. - The filtering arguments follow the same scheme as bbn.fn.search.
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