Function before

test-app/public/sinon.js:20669–20684

* Creates a function that invokes `func`, with the `this` binding and arguments * of the created function, while it's called less than `n` times. Subsequent * calls to the created function return the result of the last `func` invocation. * * @static * @me

(n, func)

         * // => Allows adding up to 4 contacts to the list.
         */
        function before(n, func) {
          var result;
          if (typeof func != 'function') {
            throw new TypeError(FUNC_ERROR_TEXT);
          }
          n = toInteger(n);
          return function() {
            if (--n > 0) {
              result = func.apply(this, arguments);
            }
            if (n <= 1) {
              func = undefined;
            }
            return result;
          };
        }
    
        /**
         * Creates a function that invokes `func` with the `this` binding of `thisArg`