Decrements the number stored at key by decrement. If the key does not exist, it is set to zero before performing the operation.
Parameters
Parameter | Type | Description |
---|
key | string | the key to decrement. |
decrement | number | the amount to decrement by |
Returns
Type | Resolves with | Rejected when |
---|
Promise<number> | On success, the promise resolves with the value of key after the decrement. | If the key contains a value of the wrong type, or contains a string that cannot be represented as an integer, the promise is rejected with an error. |
Example