Returns the sum of all items in an array, optionally specified by a specific key.
numbers:
- 5
- 10
- 20
- 40
stats:
- player: Luke Skywalker
score: 750
- player: Wedge Antilles
score: 688
- player: Jar Jar Binks
score: 1425
{{ numbers | sum }}
{{ stats | sum($score) }}
75
2863