Created
December 13, 2018 00:34
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JS Async Promise
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findUser(1) | |
.then(function(user) { | |
console.log("user:", user); | |
}); | |
function findUser(id) { | |
return new Promise(function (resolve) { | |
setTimeout(function() { | |
console.log("waited 0.1 sec."); | |
const user = { | |
id: id, | |
name: "User" + id, | |
email: id + "@test.com" | |
}; | |
resolve(user); | |
}, 100); | |
}); | |
} |
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function devide(numA, numB) { | |
return new Promise((resolve, reject) => { | |
if (numB === 0) | |
reject(new Error("Unable to devide by 0.")); | |
else | |
resolve(numA / numB); | |
}); | |
} | |
devide(8, 2) | |
.then(result => console.log("성공:", result)) | |
.catch(error => console.log("실패:", error)); | |
devide(8, 0) | |
.then(result => console.log("성공:", result)) | |
.catch(error => console.log("실패:", error)); |
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fetch('https://jsonplaceholder.typicode.com/posts/1') | |
.then(response => console.log("response:", response)) | |
.catch(error => console.log("error:", error)); |
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fetch() | |
.then(response => console.log("response:", response)) | |
.catch(error => console.log("error:", error)); |
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fetch('https://jsonplaceholder.typicode.com/posts/1') | |
.then(response => response.json()) | |
.then(post => console.log("post:", post)) | |
.catch(error => console.log("error:", error)); |
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fetch("https://jsonplaceholder.typicode.com/posts/1") | |
.then(response => response.json()) | |
.then(post => post.userId) | |
.then(userId => "https://jsonplaceholder.typicode.com/users/" + userId) | |
.then(url => fetch(url)) | |
.then(response => response.json()) | |
.then(user => console.log("user:", user)) | |
.catch(error => console.log("error:", error)); |
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