Keep getting: "nameActions[action] is not a function"

// DOM waits till page is fully loaded
document.addEventListener('DOMContentLoaded', () => {

    // variables & constants
    const form = document.getElementById('registrar');
    const input = form.querySelector('input');

    const mainDiv = document.querySelector('.main');
    const ul = document.getElementById('invitedList');

    const div = document.createElement('div');
    const filterLabel = document.createElement('label');
    const filterCheckbox = document.createElement('input');

    // checkbox and the effect of hiding invitees who haven't responded.
    filterLabel.textContent = "Hide those who haven't responded";
    filterCheckbox.type = 'checkbox';
    div.appendChild(filterLabel);
    div.appendChild(filterCheckbox);
    mainDiv.insertBefore(div, ul);
    filterCheckbox.addEventListener('change', (e) => {
        const isChecked = e.target.checked;
        const lis = ul.children;
        if (isChecked) {
            for (let i = 0; i < lis.length; i += 1) {
                let li = lis[i];
                if (li.className === 'responded') {
                    li.style.display = ''
                } else {
                    li.style.display = 'none';
                }
            }
        } else {
            for (let i = 0; i < lis.length; i += 1) {
                let li = lis[i];
                li.style.display = '';
            }
        }
    });

    function createLi(text) {
        function createElement(elementName, property, value) {
            const element = document.createElement(elementName);
            element[property] = value;
            return element;
        }

        function appendToLI(elementName, property, value) {
            const element = createElement(elementName, property, value);
            li.appendChild(element);
            return element;
        }

        const li = document.createElement('li');
        appendToLI('span', 'textContent', text);
        appendToLI('label', 'textContent', 'Confirmed')
            .appendChild(createElement('input', 'type', 'checkbox'));
        appendToLI('button', 'textContent', 'Edit');
        appendToLI('button', 'textContent', 'Remove');
        return li;
    }

    // event handler on submit
    form.addEventListener('submit', (e) => {
        e.preventDefault();
        const text = input.value;
        input.value = '';
        const li = createLi(text);
        ul.appendChild(li);
    });

    // event handler reacts to the changed state of the checkbox
    ul.addEventListener('change', (e) => {
        const checkbox = event.target;
        const checked = checkbox.checked;
        const listItem = checkbox.parentNode.parentNode;
        if (checked) {
            listItem.className = 'responded';
        } else {
            listItem.className = '';
        }
    });

    // buttom removes/edits added person
    ul.addEventListener('click', (e) => {
        if (e.target.tagName === 'BUTTON') {
            const button = e.target
            const li = button.parentNode;
            const ul = li.parentNode;
            const action = button.textContent;
            const nameActions = { /* nameActions object */
            remove: () => {
                ul.removeChild(li);
            },
            edit: () => {
                const span = li.firstElementChild;
                const input = document.createElement('input');
                input.type = 'text';
                input.value = span.textContent;
                li.insertBefore(input, span);
                li.removeChild(span);
                button.textContent = 'Save';
            },
            save: () => {
                const input = li.firstElementChild;
                const span = document.createElement('span');
                span.textContent = input.value;
                li.insertBefore(span, input);
                li.removeChild(input);
                button.textContent = 'Edit';
                }
            };
            // select and run action in button's name
            nameActions[action](); /* <-- Line 114 */
        }
    });
});