@reactory/switch-map/index.js

Easy objects switch maps in React.

'use strict';

// TODO: implement createSwitchMap(...) to create switchMap with e.g.: the default fallback
function switchMap(expression, cases, options) {
    if (typeof cases !== 'object' || cases === null) {
        throw new TypeError(
        // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
        `Cases must be an object, got: ${cases} (typeof === "${typeof cases}").`);
    }
    if (expression in cases) {
        return cases[expression];
    }
    if ('default' in cases) {
        return cases.default;
    }
    let hasFallback = false;
    let fallback;
    if (typeof options === 'object' && options !== null) {
        if ('fallback' in options) {
            hasFallback = true;
            fallback = options.fallback;
        }
    }
    if (Object.keys(cases).length === 0 && !hasFallback) {
        throw new Error('At least a default case or a fallback must be provided.');
    }
    return fallback;
}

module.exports = switchMap;
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