varbefore=require('./before');/** * Creates a function that is restricted to invoking `func` once. Repeat calls * to the function return the value of the first call. The `func` is invoked * with the `this` binding and arguments of the created function. * * @static * @memberOf _ * @category Function * @param {Function} func The function to restrict. * @returns {Function} Returns the new restricted function. * @example * * var initialize = _.once(createApplication); * initialize(); * initialize(); * // `initialize` invokes `createApplication` once */functiononce(func){returnbefore(2,func);}module.exports=once;