“continue” in cursor.forEach()

Question

I\'m building an app using meteor.js and MongoDB and I have a question about cursor.forEach(). I want to check some conditions in the beginning of each forEach iteration and

Answer 1

Here is a solution using for of and continue instead of forEach:

let elementsCollection = SomeElements.find();

for (let el of elementsCollection) {

    // continue will exit out of the current 
    // iteration and continue on to the next
    if (!el.shouldBeProcessed){
        continue;
    }

    doSomeLengthyOperation();

});

This may be a bit more useful if you need to use asynchronous functions inside your loop which do not work inside forEach. For example:

(async fuction(){

for (let el of elementsCollection) {

    if (!el.shouldBeProcessed){
        continue;
    }

    let res;

    try {
        res = await doSomeLengthyAsyncOperation();
    } catch (err) {
        return Promise.reject(err)
    }

});

})()