languageExtraction.js

export const extractParameterSimple = (name, defaultValue) => extractParameter(null, name, defaultValue);

export const extractParameter = (props, name, defaultValue) => {
    return (props && props.match.params[name]) || extractFromLocationQuery(name) || window.eventsConfig[name]
        || defaultValue;
};

export const extractFromLocationQuery = (param) => {
    const url = new URL(window.location.href);
    return url.searchParams.get(param);
};

extractParameterSimple is the function, that extracts the language from multiple sources. It has a fallback defaultValue parameter in case the key is not found.