Can I yield from an inner function?

javascript for-loop generator yield ecmascript-6

Max Heiber · Mar 28, 2015 · Viewed 14.1k times · Source

With ES6 generators, I see code like this:

var trivialGenerator = function *(array) {
    var i,item;
    for(var i=0; i < array.length; i++){
        item = array[i];
        yield item;
    };
};

Is it possible to write something more like the code below instead?

var trivialGenerator = function *(array) {
    array.forEach(function *(item){
        yield item;
    });
};

I'm asking because the classic for loop is an abomination.

Answer

No, you can't use yield inside of the inner function. But in your case you don't need it. You can always use for-of loop instead of forEach method. It will look much prettier, and you can use continue, break, yield inside it:

var trivialGenerator = function *(array) {
    for (var item of array) {
        // some item manipulation
        yield item;
    }
}

You can use for-of if you have some manipulations with item inside it. Otherwise you absolutely don't need to create this generator, as array has iterator interface natively.

Can I yield from an inner function?

Answer

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