How to Limit The Number Of Times A Function Can Be Called in Javascript

Imagine we define a function that returns the time:

var sayTime = function() {
    return Date.now()
};

Calling this function will always give us the present time (expressed in the number of milliseconds elapsed since January 1, 1970).

sayTime();
// 1527745490828

sayTime();
// 1527745493242

sayTime();
// 1527745494395

With Underscore's before function we can create a new version of this function that is can only be called a certain number of times.

var sayTimeLimited = _.before(3, sayTime);

// First call
sayTimeLimited();
// 1527745553103

// Second call
sayTimeLimited();
// 1527745557316

// Third call (and beyond) will return the memoized result of the previous call.
sayTimeLimited()
// 1527745557316

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