isBlockhash

function isBlockhash(putativeBlockhash): putativeBlockhash is Blockhash;

A type guard that returns true if the input string conforms to the Blockhash type, and refines its type for use in your program.

Parameters

Parameter	Type
`putativeBlockhash`	`string`

Returns

putativeBlockhash is Blockhash

Example

import { isBlockhash } from '@solana/rpc-types';
 
if (isBlockhash(blockhash)) {
    // At this point, `blockhash` has been refined to a
    // `Blockhash` that can be used with the RPC.
    const { value: isValid } = await rpc.isBlockhashValid(blockhash).send();
    setBlockhashIsFresh(isValid);
} else {
    setError(`${blockhash} is not a blockhash`);
}