Mar 142017

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How can I create a maximum calling limit in a function?

Sometimes we need to add a maximum limit for calling a specific function and this blog post describes how to create it.

How can I create a maximum calling limit in a function?

the target function must be asynchronous
we use U.queue(name, maximum_calls, fn(next)) method (documentation)

function someFunction(number, callback) {
    // U.queue(name, maximum, fn);
    U.queue('someFunction', 10, function(next) {

        // This context will be executed max. 10x at a time.
        console.log('PROCESSED:', number);

        setTimeout(function() {

            // IMPORTANT: it processes next item
            next();

            callback();
        }, 1000);

    });
}

Testing:

for (var i = 0; i < 100; i++)
    someFunction(i, NOOP);

How can I create a maximum calling limit in a function?

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