A CLI application that stores a multi-value dictionary in memory.
To start, clone the repo and switch to master branch. Build the project using:
npm install
To Run this CLI application use:
npm start
To Test,
npm test
The Multi-Value Dictionary app is a command line application that stores a multivalue dictionary in memory. All keys and members are strings.
It should support the following commands.
Returns all the keys in the dictionary. Order is not guaranteed.
Example
> ADD foo bar
) Added
> ADD baz bang
) Added
> KEYS
1) foo
2) baz
Returns the collection of strings for the given key. Return order is not guaranteed. Returns an error if the key does not exists.
Example:
> ADD foo bar
> ADD foo baz
> MEMBERS foo
1) bar
2) baz
> MEMBERS bad
) ERROR, key does not exist.
Adds a member to a collection for a given key. Displays an error if the member already exists for the key.
> ADD foo bar
) Added
> ADD foo baz
) Added
> ADD foo bar
) ERROR, member already exists for key
Removes a member from a key. If the last member is removed from the key, the key is removed from the dictionary. If the key or member does not exist, displays an error.
Example:
> ADD foo bar
) Added
> ADD foo baz
) Added
> REMOVE foo bar
) Removed
> REMOVE foo bar
) ERROR, member does not exist
> KEYS
1) foo
> REMOVE foo baz
) Removed
> KEYS
) empty set
> REMOVE boom pow
) ERROR, key does not exist
Removes all members for a key and removes the key from the dictionary. Returns an error if the key does not exist.
Example:
> ADD foo bar
) Added
> ADD foo baz
) Added
> KEYS
1) foo
> REMOVEALL foo
) Removed
> KEYS
(empty set)
REMOVEALL foo
) ERROR, key does not exist
Removes all keys and all members from the dictionary.
Example:
> ADD foo bar
) Added
> ADD bang zip
) Added
> KEYS
1) foo
2) bang
> CLEAR
) Cleared
> KEYS
(empty set)
> CLEAR
) Cleared
> KEYS
(empty set)
Returns whether a key exists or not.
Example:
> KEYEXISTS foo
) false
> ADD foo bar
) Added
> KEYEXISTS foo
) true
Returns whether a member exists within a key. Returns false if the key does not exist.
Example:
> MEMBEREXISTS foo bar
) false
> ADD foo bar
) Added
> MEMBEREXISTS foo bar
) true
> MEMBEREXISTS foo baz
) false
Returns all the members in the dictionary. Returns nothing if there are none. Order is not guaranteed.
Example:
> ALLMEMBERS
(empty set)
> ADD foo bar
) Added
> ADD foo baz
) Added
> ALLMEMBERS
1) bar
2) baz
> ADD bang bar
) Added
> ADD bang baz
> ALLMEMBERS
1) bar
2) baz
3) bar
4) baz
Returns all keys in the dictionary and all of their members. Returns nothing if there are none. Order is not guaranteed.
Example:
> ITEMS
(empty set)
> ADD foo bar
) Added
> ADD foo baz
) Added
> ITEMS
1) foo: bar
2) foo: baz
> ADD bang bar
) Added
> ADD bang baz
> ITEMS
1) foo: bar
2) foo: baz
3) bang: bar
4) bang: baz
Returns all possible commands
>I
'KEYS, MEMBERS, ADD, REMOVE, REMOVEALL, CLEAR, KEYEXISTS, MEMBEREXISTS, ALLMEMBERS, ITEMS, EXIT', 'I'
Exits the application.
Example:
>EXIT
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