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Promise Test

Last updated at 2020-07-11Posted at 2020-07-11

function sampleResolve(value) {
    return new Promise(resolve => {
        setTimeout(() => {
            resolve(value);
        }, 1000);
    })
}

function sample() {
    let result = 0;

    return sampleResolve(5)
        .then(val => {
            console.log(result, val)
            result += val;
            return sampleResolve(10);
        })
        .then(val => {
            console.log(result, val)
            result *= val;
            return sampleResolve(20);
        })
        .then(val => {
            console.log(result, val)
            result += val;
            return result;
        });
}

sample().then((v) => {
    console.log(v); // => 70
});

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