Feature - Value in List/Hash

[fuseraft]

Currently, to quickly check if a list contains a value, we use the .contains() builtin.

Example of using .contains()

list  = [1, 2, 3]
value = 2

if list.contains(value)
  println "${list} contains ${value}"
end

To check if a hash contains a key, we use the .has_key() builtin. Alternatively, we can use the .keys() builtin, and call .contains() on that.

Example of using .has_key()

hash = { "name": "Scott", "website": "https://fuseraft.com" }
key = "name"

# check if hash contains a given key
if hash.has_key(key)
  println "${hash} contains ${key}"
end

# it is functionally equivalent to:
if hash.keys().contains(key)
  println "${hash} contains ${key}"
end

Perhaps we can introduce a new usage for the in keyword that consolidates these.

Example of proposed in keyword usage

list  = [1, 2, 3]
value = 2

if value in list
  println "${list} contains ${value}"
end

hash = { "name": "Scott", "website": "https://fuseraft.com" }
key = "name"

if key in hash.keys()
  println "${hash} contains ${key}"
end