Error handling and stack traces in promise chain catches etc...

promises.js

function eq(a, b) {
    return new Promise(function(resolve, reject) {
        a === b ?
        resolve(`${ a } === ${ b }`) :
        reject(`${ a } !== ${ b }`);
    });
}

function eqs(a, b) {
    return new Promise(function(resolve, reject) {
        try {
            if (a === b) {
                resolve(`${ a } === ${ b }`);
            } else {
                throw new Error(`${ a } !== ${ b }`);
            }
        } catch(e) {
            reject(e.stack);
        }
    });
}

Promise.resolve('Running with only reject')
    .then(function(res) {
        console.log(res);
        return eq(2, 2);
    })
    .then(function(res) {
        console.log(res);
        return eq(3, 2);
    })
    .then(function() {
        console.log("I'll never run :(");
    })
    .catch(function(err) {
        console.error(err);
        console.log();
        return 'Running with Error stack trace';
    })
    .then(function(res) {
        console.log(res);
        return eqs(2, 2);
    })
    .then(function(res) {
        console.log(res);
        return eqs(3, 2);
    })
    .then(function() {
        console.log("I'll never run either :(((");
    })
    .catch(function(err) {
        console.log(err);
    });