Created
September 17, 2019 03:23
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| // Write a function which takes a name, and then 400ms later, returns the string "Hello, " + name | |
| // 1. Promise | |
| // 2. Async/Await | |
| // 3. Callback | |
| // using promise | |
| var sayHelloPromise = function (name) { | |
| return new Promise( | |
| function (resolve, reject) { | |
| setTimeout(() => { | |
| var message = "Hello, " + name; | |
| console.log(message) | |
| resolve(message); | |
| }, 400) | |
| } | |
| ); | |
| }; | |
| // using async await | |
| const sayHelloAsync = async name => { | |
| await new Promise(resolve => setTimeout(resolve, 400)); | |
| console.log("Hello, " + name) | |
| return "Hello, " + name; | |
| } | |
| // using callback | |
| const sayHelloCallback = (name, callback) => { | |
| setTimeout(() => { | |
| callback("Hello, " + name); | |
| }, 400); | |
| } | |
| function callback(greeting) { | |
| console.log(greeting) | |
| return greeting | |
| } | |
| sayHelloPromise("catch"); | |
| sayHelloAsync("catch"); | |
| sayHelloCallback("catch", callback); |
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