question/implement-once

[giscus[bot]]

question/implement-once

北美前端面试攻略

https://us-fe.github.io/question/implement-once.html

[xiaoyu2er]

/**
 * @param {Function} func
 * @return {Function}
 */
function once(func) {
  let called = false;
  let result;
  return function () {
    if (called) return result;
    result = func.apply(this, arguments);
    called = true;
    return result;
  }
}