near_sdk::env

Function storage_remove

Source 
pub fn storage_remove(key: &[u8]) -> bool
Expand description

Removes the value stored under the given key. If key-value existed returns true, otherwise false.

§Use cases

Storage functions are typically used to upgrade/migrate a contract state, preventing errors like Cannot deserialize the contract state after rolling out the breaking changes to the network. For practical examples, see different implementations in this repository.

§Examples

use near_sdk::env::{storage_write, storage_remove};

assert_eq!(storage_remove(b"key"), false);
storage_write(b"key", b"value");
assert_eq!(storage_remove(b"key"), true);

Example of usage here