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example.4.js
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example.4.js
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/**
* Nota bene:
* `The callback will likely not be invoked in precisely delay milliseconds.
* Node.js makes no guarantees about the exact timing of when callbacks will fire,
* nor of their ordering.
* The callback will be called as close as possible to the time specified.`
* Source: https://nodejs.org/api/timers.html#timers_settimeout_callback_delay_args
**/
/**
* One second addition, non-blocking using setTimeout()
**/
const longAdd = (a, b, callback) => {
console.log(`Thinking about: ${a} + ${b}`);
console.log('Non blocking sleep 3s');
setTimeout(() => {
console.log(`Done thinking about: ${a} + ${b}`);
const sum = a + b;
callback(null, sum);
}, 3000);
};
/**
* One second multiplication, non-blocking using setTimeout()
**/
const longMultiply = (a, b, callback) => {
console.log(`Thinking about: ${a} * ${b}`);
console.log('Non blocking sleep 1s');
setTimeout(() => {
console.log(`Done thinking about: ${a} * ${b}`);
const sum = a * b;
callback(null, sum);
}, 1000);
};
console.log('--A--');
longAdd(2, 3, (errOne, sum) => {
console.log(`Sum: ${sum}`);
console.log('--B--');
longMultiply(sum, 4, (errTwo, product) => {
console.log(`Product: ${product}`);
});
});
console.log('--C--');
/**
--A--
Thinking about: 2 + 3
Non blocking sleep 3s
--C--
Done thinking about: 2 + 3
Sum: 5
--B--
Thinking about: 5 * 4
Non blocking sleep 1s
Done thinking about: 5 * 4
Product: 20
**/