option-t
Version:
A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.
14 lines (13 loc) • 414 B
JavaScript
/**
* Return the result of _transformer_ with using _input_ as an argument for it if _input_ is `Some(T)`.
* Otherwise, return _defaultValue_.
*
* Basically, this operation is a combination `map()` and `unwrapOr()`.
*/
export function mapOrForOption(input, defaultValue, transformer) {
if (!input.ok) {
return defaultValue;
}
const result = transformer(input.val);
return result;
}