boilerplate.js/Boilerplate/src/js/helpers/ensureObj.js

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function ensureObj(obj, key, value) {
    obj = obj || {};
    let keys = key.split('.');
    let last = keys.pop();
    
    keys.forEach(key => {
        obj[key] = obj[key] || {};
        obj = obj[key];
    });

    if (value) obj[last] = value;
    return obj;
}