CODEWITHSUNDEEP
javascriptjquery
Debopam
Debopam

Reputation: 3356

jQuery / Javascript function execution

I have 3 functions func1(), func2() and func3(). They are independent of each other. I would like to execute these 3 methods in parallel and with a single call back method. is it possible something like this

function parentMethod(){
 call ([func1(),func2(), func3()],<callback function>);
}

Callback functionality is optional but can these 3 functions be executed in parallel.

Upvotes: 0

Views: 70

Answers (3)

artemisian
artemisian

Reputation: 3106

You can also use web workers but it'll be a little more verbose solution. You can check this post: HTML5/JS - Start several webworkers

Upvotes: 0

bcr
bcr

Reputation: 3811

Adding to the promise answer given, you'll need to "promisify" your functions if they don't already return promises (this demo assumes an error-first callback):

let promises = [func1, func2, func3].map(func => {
    return new Promise((resolve, reject) => {
        func((err, data) => {
            if (err) {
                reject(err);
            } else {
                resolve(data);
            }
        })
    });
});

Promise.all(promises)
    .then((results) => {
        let [func1Data, func2Data, func3Data] = results;
    })
    .catch(err => {
        console.log('error!', err);
    });

Upvotes: 2

Sterling Archer
Sterling Archer

Reputation: 22395

Use a promise chain with Promise.all

Promise.all([func1, func2, func3]).then(values => {
    //values from all the functions are in the callback param
});

Upvotes: 3

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