Rhai expressions cheatsheet

In this cheatsheet are grouped the most frequent manipulations that can be done through Rhai, for convenience.

Cheatsheet

Arrays

Filtering an array

[1, 2, 3].filter(|value| value % 2 == 0)
=> [2]

Finding the index of an element inside an array

["wow", "check"].index_of(|value| value == "check")
=> 1

Finding an element inside an array

let nodelist = [
  #{resource_id: 5, name: "foo"},
  #{resource_id: 12, name: "bar"}
];

nodelist.find(|value| value.resource_id == 5)
=> #{"name": "foo", "resource_id": 5}

Checking if an expression is true for every element of an array

[2, 4, 6].all(|value| value % 2 == 0)
=> true

Maps

Get only keys (returns an array)

#{a: 1, b: 2}.keys()
=> ["a", "b"]

Get only values (returns an array)

#{a: 1, b: 2}.values()
=> [1, 2]

Check if a map has more than 5 keys which name starts with “ring”

let map = #{
  ring_one: 12,
  ring_two: 34,
  ring_three: 90,
  ring_four: 234,
  ring_five: 908
};

map.keys().filter(|prop| prop.starts_with("ring")).len() >= 5
=> true

Strings

Splitting a string

"a;b;c".split(";")
=> ["a", "b", "c"]