call function one per second

app.coffee

oneTimePer = (ms, func) ->
  ms or (ms = 1000)
  ->
    self = arguments.callee
    self._lastTimeCalled = new Date  unless self.hasOwnProperty("_lastTimeCalled")
    if new Date - self._lastTimeCalled > ms
      self._lastTimeCalled = new Date
      func.apply this, arguments

myFunc = oneTimePer 2000, (x, y) -> x + y
setInterval (->
  console.log myFunc(1, 2)
), 100

app.js

var oneTimePer = function oneTimePer(ms, func) {
    // 1 second by default
    ms || (ms = 1000)
    return function() {
        var self = arguments.callee
        if (!self.hasOwnProperty('_lastTimeCalled')) {
            self._lastTimeCalled = new Date
        }
        if (new Date - self._lastTimeCalled > ms) {
            self._lastTimeCalled = new Date
            return func.apply(this, arguments)
        }
    }
}

// example:
var myFunc = oneTimePer(2000, function(x, y) {
    return x + y
})
setInterval(function() {
    console.log(myFunc(1, 2))
}, 100)