react-bootstrap/amd/lib/utils/createChainedFunction.js

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define(function (require, exports, module) {/**
 * Safe chained function
 *
 * Will only create a new function if needed,
 * otherwise will pass back existing functions or null.
 *
 * @param {function} one
 * @param {function} two
 * @returns {function|null}
 */
function createChainedFunction(one, two) {
  var hasOne = typeof one === 'function';
  var hasTwo = typeof two === 'function';

  if (!hasOne && !hasTwo) { return null; }
  if (!hasOne) { return two; }
  if (!hasTwo) { return one; }

  return function chainedFunction() {
    one.apply(this, arguments);
    two.apply(this, arguments);
  };
}

module.exports = createChainedFunction;
});