In-Memory Database

An in-memory database that supports basic CRUD operations, incrementing/decrementing numeric values, and setting TTLs for keys.

Note that this implementation is not thread-safe and should not be used in a multi-threaded environment.

Methods

set(key: string, value: any): void

Sets the value for a given key.

If the key already has a TTL, it will be cleared.

Parameters

• key (string): The key to set.
• value (any): The value to set.

get(key: string): any | null

Gets the value for a given key.

Parameters

• key (string): The key to get.

Returns

• (any | null): The value for the key, or null if the key does not exist.

del(key: string): void

Deletes a key from the database.

Parameters

• key (string): The key to delete.

expire(key: string, seconds: number): void

Sets a TTL for a given key.

If the key already has a TTL, it will be cleared before setting a new one.

Parameters

• key (string): The key to set a TTL for.
• seconds (number): The number of seconds until the key expires.

incr(key: string): number | null

Increments a numeric value for a given key.

If the key does not exist, it will be created with a value of 1.

Parameters

• key (string): The key to increment.

Returns

• (number | null): The new value for the key, or null if the value is not a number.

decr(key: string): number | null

Decrements a numeric value for a given key.

If the key does not exist, it will be created with a value of -1.

Parameters

• key (string): The key to decrement.

Returns

• (number | null): The new value for the key, or null if the value is not a number.

exists(key: string): boolean

Checks if a key exists in the database.

Parameters

• key (string): The key to check.

Returns

• (boolean): True if the key exists, false otherwise.

flushAll(): void

Clears all keys from the database.