Once

once.js

const once = (function () {
    const fns = [];
    let i = 0;
    return function (fn) {
        const cur = i++;
        fns[cur] = fn;
        return function () {
            if (fns[cur]) {
                fns[cur].apply(null, arguments);
                fns[cur] = null;
            }
        }
    }
})();
const query = once(sendRequest);
function MyComponent() {
    query();
}

once.ls

once = let fns = [], i = 0
  ->
    cur = i++
    fns[cur] = it
    ->
      fns[cur]? ...
      fns[cur] = void