A simple function for simulating an "if statement" within a react render

gistfile1.js

/**
* Calls the callback and returns its result if the expression is truthy
*
* @param  {string}   expression
* @param  {Function} callback
* @return {variant}              Value of callback() if expression is true. Otherwise 'undefined'
*/
export function iff(expression, callback) {
  if (expression) {
    return callback();
  }
  return void 0;
}