underscore/cjs/before.js

JavaScript's functional programming helper library.

// 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;