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Filename : before.js

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// Returns a function that will only be executed up to (but not including) the
// Nth call.
function before(times, func) {
  var memo;
  return function() {
    if (--times > 0) {
      memo = func.apply(this, arguments);
    }
    if (times <= 1) func = null;
    return memo;
  };
}

module.exports = before;