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| async function doSomething() { | |
| return new Promise((resolve, reject) => { | |
| setTimeout(() => resolve("done!"), 1000) | |
| }); | |
| } | |
| // Rejection case | |
| async function doSomethingBad() { | |
| return new Promise((resolve, reject) => { | |
| setTimeout(() => reject("crap!"), 1000) | |
| }); | |
| } | |
| // Exception case | |
| async function throwSomethingBad() { | |
| return window.test.test; | |
| } | |
| async function makeItNice(fn) { | |
| let result = null; | |
| let error = null; | |
| try { | |
| result = await fn() | |
| } catch(e) { | |
| error = e; | |
| } | |
| return [result, error]; | |
| } | |
| async function test() { | |
| // REJECT CASE | |
| /* let [result, error] = await makeItNice(doSomethingBad) */; | |
| // THROW CASE | |
| /* let [result, error] = await makeItNice(throwSomethingBad) */; | |
| // HAPPY CASE | |
| let [result, error] = await makeItNice(doSomething); | |
| if (error) { | |
| if (!error.name) { | |
| console.log('Err... promise rejected'); | |
| } else { | |
| console.log("it's a real exception!", error.name); | |
| // bla bla | |
| // error.name doesn't exist on rejected promises | |
| // ... unless you reject with an object with a name property ofc:D | |
| } | |
| return; | |
| } | |
| if (result) { | |
| console.log('Works!', result); | |
| } | |
| } | |
| test(); |
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