option-t/esm/deprecated/plain_option/map.js

A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.

import { createSome } from './option.js';
/**
 *  Maps a `Option<T>` to `Option<U>` by applying a _transformer_ function
 *  to an contained `Some(T)` value, leaving an `None` value untouched.
 *
 *  This function can be used to compose the results of two functions.
 */
export function mapForOption(input, transformer) {
    if (!input.ok) {
        return input;
    }
    const result = transformer(input.val);
    return createSome(result);
}