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Associative array/Creation: Difference between revisions
→[[OCaml]]
m (→[[Ruby]]: Updated formatting. Added link to nil.) |
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Line 138:
hash[777] # => 'unknown key 777'
hash[666] # => 'devil'
==[[OCaml]]==
A simple idiom to create a hash table mapping strings to integers:
let hash = Hashtbl.create 0;;
List.iter (fun (key, value) -> Hashtbl.add hash key value)
["foo", 5; "bar", 10; "baz", 15];;
To retrieve a value:
let bar = Hashtbl.find hash "bar";; (* bar = 5 *)
To retrieve a value, returning a default if the key is not found:
let quux = try Hashtbl.find hash "quux" with Not_found -> some_value;;
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