omit.js

const stringCheck = (keyToOmit) => (value, key) => keyToOmit === key;

const arrayOfStringCheck = (keysToOmit) => (value, key) => keysToOmit.includes(key);

const omit = (targetObject, options) => {
    const check = typeof options === 'function' ? options : Array.isArray(options) ? arrayOfStringCheck : stringCheck;

    return Object.keys(targetObject).reduce((result, key) => {
            if (!check(targetObject[key], key, targetObject)) {
                result[key] = targetObject[key];
            }

            return result;
        }, {});
};