Function getPrefix

packages/db-ivm/src/indexes.ts:481–494

* This function extracts the prefix from a value. * @param value - The value to extract the prefix from. * @returns The prefix and the suffix.

(value: TValue)

 * @returns The prefix and the suffix.
 */
function getPrefix<TValue, TPrefix>(value: TValue): TPrefix | NO_PREFIX {
  // If the value is an array and the first element is a string or number, then the
  // first element is the prefix. This is used to distinguish between values without
  // the need for hashing unless there are multiple values for the same prefix.
  if (
    Array.isArray(value) &&
    (typeof value[0] === `string` ||
      typeof value[0] === `number` ||
      typeof value[0] === `bigint`)
  ) {
    return value[0] as TPrefix
  }
  return NO_PREFIX
}

/**
 * This function checks if a value is a single value.