@proem/variant/lib/index.js

proem package for handling algebraic data types

import * as array from '@proem/array';
export function tags() {
    var tags = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        tags[_i] = arguments[_i];
    }
    return tags;
}
export function oneOf(variant, tags) {
    return array.includes(tags, variant.type);
}
export function map(cases, or) {
    return function (variant) {
        var caseFn = cases[variant.type];
        if (!caseFn) {
            if (!or) {
                throw Error("No match case found for \"" + variant.type + "\"");
            }
            return or(variant);
        }
        return caseFn(variant);
    };
}
export function reducer(caseReducers) {
    return function (state, variant) {
        var arm = caseReducers[variant.type];
        if (!arm) {
            return state;
        }
        return arm(state, variant);
    };
}
//# sourceMappingURL=index.js.map