sereneLog lets you log stuff without freaking you and your browser and out. Especially useful for debugging the progress of long loops.

sereneLog.js

;(function (window) {

  /* Throttle fn modified from underscore.js */
  var _throttle = function (func, wait) {
    var context
    var args
    var result
    var timeout = null
    var previous = 0

    var later = function() {
      previous = new Date
      timeout = null
      result = func.apply(context, args)
    }

    return function() {
      var now = new Date
      var remaining = wait - (now - previous)
      context = this
      args = arguments
      if (remaining <= 0) {
        clearTimeout(timeout)
        timeout = null
        previous = now
        result = func.apply(context, args)
      } else if (!timeout) {
        timeout = setTimeout(later, remaining)
      }
      return result
    }
  }

  /* Export sereneLog */
  window.sereneLog = _throttle(function () {
    var args = Array.prototype.slice.call(arguments)
    console.log.apply(console, args)
  }, 100) // Change the time (in ms) here to have more or fewer logs

})(window)

/* Will print a ton of logs */
var now = Date.now()
while (Date.now() - now < 2000) {
  console.log('foo', 'bar')
}

/* Will print 20 or 21 logs */
var now = Date.now()
while (Date.now() - now < 2000) {
  sereneLog('foo', 'bar')
}