How to skip over an element in .map()?

Question

How can I skip an array element in .map?

My code:

var sources = images.map(function (img) {
    if(img.src.split(\'.\').pop() === \"json         


        

Answer 1

Here's a utility method (ES5 compatible) which only maps non null values (hides the call to reduce):

function mapNonNull(arr, cb) {
    return arr.reduce(function (accumulator, value, index, arr) {
        var result = cb.call(null, value, index, arr);
        if (result != null) {
            accumulator.push(result);
        }

        return accumulator;
    }, []);
}

var result = mapNonNull(["a", "b", "c"], function (value) {
    return value === "b" ? null : value; // exclude "b"
});

console.log(result); // ["a", "c"]