Control how many times a function is called

occur.js

/**
 * @param {Function} f
 * @param {number} times
 * @return {Function} 
 * If positive, limited to run only <var>times</var> times.
 * If negative, prevented being run until called -<var>times</var> times
 */
function occur(f, times) {
  if (times === 1/0) return f
  times = ~~times
  var memo
  return times > 0 ? function() {
    if (f && times--) memo = f.apply(this, arguments)
    else f = times = null
    return memo
  } : times < 0 ? function() {
    if (times < 0) return void ++times
    times = null
    return f.apply(this, arguments)
  } : function() {}
}

module.exports = occur;